diff --git a/dlls/msvcrt/cppexcept.h b/dlls/msvcrt/cppexcept.h
index 0818fa71c16..1a3919eaa30 100644
--- a/dlls/msvcrt/cppexcept.h
+++ b/dlls/msvcrt/cppexcept.h
@@ -26,7 +26,7 @@
 
 typedef void (*vtable_ptr)();
 
-/* type_info object, see cpp.c for inplementation */
+/* type_info object, see cpp.c for implementation */
 typedef struct __type_info
 {
   const vtable_ptr *vtable;
diff --git a/dlls/msvcrt/main.c b/dlls/msvcrt/main.c
index 781f0684b71..c807209f9a7 100644
--- a/dlls/msvcrt/main.c
+++ b/dlls/msvcrt/main.c
@@ -124,7 +124,7 @@ void CDECL MSVCRT_I10_OUTPUT(void)
 {
   /* FIXME: This is probably data, not a function */
   /* no it is a function. I10 is an Int of 10 bytes */
-  /* also known as 80 bit flotaing point (long double */
+  /* also known as 80 bit floating point (long double */
   /* for some compilers, not MSVC) */
 }
 
diff --git a/dlls/msvcrt/tests/string.c b/dlls/msvcrt/tests/string.c
index 926a9cf3764..3da32d863b8 100644
--- a/dlls/msvcrt/tests/string.c
+++ b/dlls/msvcrt/tests/string.c
@@ -576,11 +576,11 @@ static void test_wcscpy_s(void)
         return;
     }
 
-    /* Test NULl Dest */
+    /* Test NULL Dest */
     ret = p_wcscpy_s(NULL, 18, szLongText);
     ok(ret == EINVAL, "p_wcscpy_s expect EINVAL got %d\n", ret);
 
-    /* Test NULl Source */
+    /* Test NULL Source */
     szDest[0] = 'A';
     ret = p_wcscpy_s(szDest, 18, NULL);
     ok(ret == EINVAL, "expected EINVAL got %d\n", ret);
diff --git a/dlls/msvcrt/undname.c b/dlls/msvcrt/undname.c
index dfc2241409c..16991eb295d 100644
--- a/dlls/msvcrt/undname.c
+++ b/dlls/msvcrt/undname.c
@@ -516,7 +516,7 @@ static char* get_template_name(struct parsed_symbol* sym)
  * template argument list). The class name components appear in the reverse
  * order in the mangled name, e.g aaa@bbb@ccc@@ will be demangled to
  * ccc::bbb::aaa
- * For each of this class name componets a string will be allocated in the
+ * For each of these class name components a string will be allocated in the
  * array.
  */
 static BOOL get_class(struct parsed_symbol* sym)
@@ -678,7 +678,7 @@ static const char* get_simple_type(char c)
 }
 
 /*******************************************************************
- *         get_extented_type
+ *         get_extended_type
  * Return a string containing an allocated string for a simple data type
  */
 static const char* get_extended_type(char c)
diff --git a/dlls/mswsock/mswsock.c b/dlls/mswsock/mswsock.c
index d2834052713..bdf4d3096cd 100644
--- a/dlls/mswsock/mswsock.c
+++ b/dlls/mswsock/mswsock.c
@@ -104,7 +104,7 @@ VOID WINAPI GetAcceptExSockaddrs(
 BOOL WINAPI TransmitFile(
         SOCKET hSocket, /* [in] Handle to a connected socket */
 	HANDLE hFile,   /* [in] Handle to the open file that should be
-                           transmited */
+                           transmitted */
 	DWORD nNumberOfBytesToWrite, /* [in] Number of file bytes to 
                                         transmit */
 	DWORD nNumberOfBytesPerSend, /* [in] Size in bytes of each block of
diff --git a/dlls/msxml3/node.c b/dlls/msxml3/node.c
index 4cec2d3bef4..ee4e1b25adc 100644
--- a/dlls/msxml3/node.c
+++ b/dlls/msxml3/node.c
@@ -1007,7 +1007,7 @@ static HRESULT WINAPI xmlnode_get_xml(
         {
             const xmlChar *pContent;
 
-            /* Attribute Nodes return a space infront of their name */
+            /* Attribute Nodes return a space in front of their name */
             pContent = xmlBufferContent(pXmlBuf);
             if( ((char*)pContent)[0] == ' ')
                 *xmlString = bstr_from_xmlChar(pContent+1);
diff --git a/dlls/msxml3/pi.c b/dlls/msxml3/pi.c
index 5fad22c6a50..f04affbefc2 100644
--- a/dlls/msxml3/pi.c
+++ b/dlls/msxml3/pi.c
@@ -206,7 +206,7 @@ static HRESULT WINAPI dom_pi_put_nodeValue(
 
     TRACE("%p\n", This );
 
-    /* Cannot set data to a PI node whos target is 'xml' */
+    /* Cannot set data to a PI node whose target is 'xml' */
     hr = dom_pi_get_nodeName(iface, &sTarget);
     if(hr == S_OK)
     {
@@ -530,7 +530,7 @@ static HRESULT WINAPI dom_pi_put_data(
 
     TRACE("%p %s\n", This, debugstr_w(data) );
 
-    /* Cannot set data to a PI node whos target is 'xml' */
+    /* Cannot set data to a PI node whose target is 'xml' */
     hr = dom_pi_get_nodeName(iface, &sTarget);
     if(hr == S_OK)
     {
diff --git a/dlls/msxml3/tests/domdoc.c b/dlls/msxml3/tests/domdoc.c
index 00eb52acc22..9c6eb66d041 100644
--- a/dlls/msxml3/tests/domdoc.c
+++ b/dlls/msxml3/tests/domdoc.c
@@ -1783,7 +1783,7 @@ static void test_IXMLDOMDocument2(void)
     ole_check(IXMLDOMDocument2_setProperty(doc2, _bstr_("SelectionLanguage"), _variantbstr_("XPath")));
     ole_check(IXMLDOMDocument2_setProperty(doc2, _bstr_("SelectionLanguage"), _variantbstr_("XSLPattern")));
 
-    /* contrary to what MSDN calims you can switch back from XPath to XSLPattern */
+    /* contrary to what MSDN claims you can switch back from XPath to XSLPattern */
     ole_check(IXMLDOMDocument2_getProperty(doc2, _bstr_("SelectionLanguage"), &var));
     expect_eq(V_VT(&var), VT_BSTR, int, "%x");
     expect_bstr_eq_and_free(V_BSTR(&var), "XSLPattern");
diff --git a/dlls/netapi32/ds.c b/dlls/netapi32/ds.c
index 819dc23be3e..740ef5d377f 100644
--- a/dlls/netapi32/ds.c
+++ b/dlls/netapi32/ds.c
@@ -77,7 +77,7 @@ VOID WINAPI DsRoleFreeMemory(PVOID Buffer)
  *  DsRoleGetPrimaryDomainInformation  (NETAPI32.@)
  *
  * PARAMS
- *  lpServer  [I] Pointer to UNICODE string with Computername
+ *  lpServer  [I] Pointer to UNICODE string with ComputerName
  *  InfoLevel [I] Type of data to retrieve	
  *  Buffer    [O] Pointer to to the requested data
  *
diff --git a/dlls/netapi32/nbnamecache.h b/dlls/netapi32/nbnamecache.h
index 987c6c4946b..b227ed641e6 100644
--- a/dlls/netapi32/nbnamecache.h
+++ b/dlls/netapi32/nbnamecache.h
@@ -45,7 +45,7 @@ typedef struct _NBNameCacheEntry
 
 /* Functions that create, manipulate, and destroy a name cache.  Thread-safe,
  * with the exception of NBNameCacheDestroy--ensure that no other threads are
- * manipulating the cache before destoying it.
+ * manipulating the cache before destroying it.
  */
 
 /* Allocates a new name cache from heap, and sets the expire time on new
diff --git a/dlls/netapi32/nbt.c b/dlls/netapi32/nbt.c
index 1186572dab7..a47229cb0e0 100644
--- a/dlls/netapi32/nbt.c
+++ b/dlls/netapi32/nbt.c
@@ -46,7 +46,7 @@
  *   name.  Although it allows sessions to be created with '*' as the calling
  *   name, doing so results in timeouts for all receives, because the
  *   application never gets them.
- *   So, a well-behaved Netbios application will typically want to register a
+ *   So, a well-behaved NetBIOS application will typically want to register a
  *   name.  I should probably support a do-nothing name list that allows
  *   NCBADDNAME to add to it, but doesn't actually register the name, or does
  *   attempt to register it without being able to defend it.
diff --git a/dlls/netapi32/wksta.c b/dlls/netapi32/wksta.c
index 9a4d5310e5e..1eb22d6d6a7 100644
--- a/dlls/netapi32/wksta.c
+++ b/dlls/netapi32/wksta.c
@@ -103,7 +103,7 @@ static void wprint_mac(WCHAR* buffer, int len, const MIB_IFROW *ifRow)
 
 /* Theoretically this could be too short, except that MS defines
  * MAX_ADAPTER_NAME as 128, and MAX_INTERFACE_NAME_LEN as 256, and both
- * represent a count of WCHARs, so even with an extroardinarily long header
+ * represent a count of WCHARs, so even with an extraordinarily long header
  * this will be plenty
  */
 #define MAX_TRANSPORT_NAME MAX_INTERFACE_NAME_LEN
diff --git a/dlls/ntdll/directory.c b/dlls/ntdll/directory.c
index 44cf615e3dd..2b53245a547 100644
--- a/dlls/ntdll/directory.c
+++ b/dlls/ntdll/directory.c
@@ -1866,7 +1866,7 @@ static inline int get_dos_prefix_len( const UNICODE_STRING *name )
  *
  * Convert a file name from NT namespace to Unix namespace.
  *
- * If disposition is not FILE_OPEN or FILE_OVERWRITTE, the last path
+ * If disposition is not FILE_OPEN or FILE_OVERWRITE, the last path
  * element doesn't have to exist; in that case STATUS_NO_SUCH_FILE is
  * returned, but the unix name is still filled in properly.
  */
diff --git a/dlls/ntdll/path.c b/dlls/ntdll/path.c
index 8730af37f23..d7be1839549 100644
--- a/dlls/ntdll/path.c
+++ b/dlls/ntdll/path.c
@@ -428,7 +428,7 @@ BOOLEAN  WINAPI RtlDosPathNameToNtPathName_U(PCWSTR dos_path,
 /******************************************************************
  *		RtlDosSearchPath_U
  *
- * Searchs a file of name 'name' into a ';' separated list of paths
+ * Searches a file of name 'name' into a ';' separated list of paths
  * (stored in paths)
  * Doesn't seem to search elsewhere than the paths list
  * Stores the result in buffer (file_part will point to the position
diff --git a/dlls/ntdll/reg.c b/dlls/ntdll/reg.c
index 9d9de0e4eed..425ddf84890 100644
--- a/dlls/ntdll/reg.c
+++ b/dlls/ntdll/reg.c
@@ -1126,8 +1126,8 @@ static NTSTATUS RTL_GetKeyHandle(ULONG RelativeTo, PCWSTR Path, PHANDLE handle)
  *  RelativeTo  [I] Registry path that Path refers to
  *  Path        [I] Path to key
  *  QueryTable  [I] Table of key values to query
- *  Context     [I] Paremeter to pass to the application defined QueryRoutine function
- *  Environment [I] Optional parameter to use when performing expantion
+ *  Context     [I] Parameter to pass to the application defined QueryRoutine function
+ *  Environment [I] Optional parameter to use when performing expansion
  *
  * RETURNS
  *  STATUS_SUCCESS or an appropriate NTSTATUS error code.
diff --git a/dlls/ntdll/relay.c b/dlls/ntdll/relay.c
index f9679a6e37d..a3031f28e3c 100644
--- a/dlls/ntdll/relay.c
+++ b/dlls/ntdll/relay.c
@@ -699,7 +699,7 @@ FARPROC SNOOP_GetProcAddress( HMODULE hmod, const IMAGE_EXPORT_DIRECTORY *export
     if (!check_from_module( debug_from_snoop_includelist, debug_from_snoop_excludelist, user ))
         return origfun; /* the calling module was explicitly excluded */
 
-    if (!*(LPBYTE)origfun) /* 0x00 is an imposs. opcode, poss. dataref. */
+    if (!*(LPBYTE)origfun) /* 0x00 is an impossible opcode, possible dataref. */
         return origfun;
 
     sec = RtlImageRvaToSection( RtlImageNtHeader(hmod), hmod, (char *)origfun - (char *)hmod );
diff --git a/dlls/ntdll/serial.c b/dlls/ntdll/serial.c
index c54d70696e6..8155d67a285 100644
--- a/dlls/ntdll/serial.c
+++ b/dlls/ntdll/serial.c
@@ -1079,7 +1079,7 @@ static NTSTATUS wait_on(HANDLE hDevice, int fd, HANDLE hEvent, DWORD* events)
         (status = get_modem_status(fd, &commio->mstat)))
         goto out_now;
 
-    /* We might have received something or the TX bufffer is delivered */
+    /* We might have received something or the TX buffer is delivered */
     *events = check_events(fd, commio->evtmask,
                                &commio->irq_info, &commio->irq_info,
                                commio->mstat, commio->mstat);
diff --git a/dlls/ntdll/tests/atom.c b/dlls/ntdll/tests/atom.c
index 49bf48e47ac..87ea222a8f7 100644
--- a/dlls/ntdll/tests/atom.c
+++ b/dlls/ntdll/tests/atom.c
@@ -303,7 +303,7 @@ static void test_NtIntAtom(void)
 
     if (!res)
     {
-        /* According to the kernel32 functions, integer atoms are only allowd from
+        /* According to the kernel32 functions, integer atoms are only allowed from
          * 0x0001 to 0xbfff and not 0xc000 to 0xffff, which is correct */
         res = pRtlAddAtomToAtomTable(AtomTable, (PWSTR)0, &testAtom);
         ok(res == STATUS_INVALID_PARAMETER, "Didn't get expected result from adding 0 int atom, retval: %x\n", res);
diff --git a/dlls/ntdll/tests/env.c b/dlls/ntdll/tests/env.c
index d8229460bbf..3363e73484e 100644
--- a/dlls/ntdll/tests/env.c
+++ b/dlls/ntdll/tests/env.c
@@ -214,7 +214,7 @@ static void testExpand(void)
          * Interestingly enough, with a 8 WCHAR buffers, we get on 2k:
          *      helloIII
          * so it seems like strings overflowing the buffer are written 
-         * (troncated) but the write cursor is not advanced :-/
+         * (truncated) but the write cursor is not advanced :-/
          */
         {NULL, NULL}
     };
diff --git a/dlls/ntdll/tests/om.c b/dlls/ntdll/tests/om.c
index 0eacd202a93..d211ea00432 100644
--- a/dlls/ntdll/tests/om.c
+++ b/dlls/ntdll/tests/om.c
@@ -418,7 +418,7 @@ static void test_directory(void)
     pRtlFreeUnicodeString(&str);
     InitializeObjectAttributes(&attr, &str, 0, dir, NULL);
 
-    /* Test inavalid paths */
+    /* Test invalid paths */
     pRtlCreateUnicodeStringFromAsciiz(&str, "\\om.c-mutant");
     status = pNtCreateMutant(&h, GENERIC_ALL, &attr, FALSE);
     ok(status == STATUS_OBJECT_PATH_SYNTAX_BAD,
diff --git a/dlls/ntdll/tests/reg.c b/dlls/ntdll/tests/reg.c
index 14cc79f629f..94f2a0b6630 100644
--- a/dlls/ntdll/tests/reg.c
+++ b/dlls/ntdll/tests/reg.c
@@ -283,7 +283,7 @@ static void test_RtlQueryRegistryValues(void)
     8)DefaultLength     Test Default Length with DefaultType = REG_SZ
    9)DefaultLength      Test Default Length with DefaultType = REG_MULTI_SZ
    10)DefaultLength     Test Default Length with DefaultType = REG_EXPAND_SZ
-   11)DefaultData       Test whether DefaultData is used while DefaltType = REG_NONE(shouldn't be)
+   11)DefaultData       Test whether DefaultData is used while DefaultType = REG_NONE(shouldn't be)
    12)Delete            Try to delete value key
 
     */
diff --git a/dlls/ntdll/tests/rtl.c b/dlls/ntdll/tests/rtl.c
index 40d13fd9544..3fdb864a172 100644
--- a/dlls/ntdll/tests/rtl.c
+++ b/dlls/ntdll/tests/rtl.c
@@ -647,7 +647,7 @@ static void test_RtlRandom(void)
         seed, seed_expected);
 /*
  * Seed is not equal to result as with RtlUniform. To see more we
- * call RtlRandom aggain with seed set to 0:
+ * call RtlRandom again with seed set to 0:
  */
     seed = 0;
     result_expected = 0x7fffffc3;
@@ -701,7 +701,7 @@ static void test_RtlRandom(void)
  * RtlRandom(&seed);
  *
  * assigns to seed. Putting these two findings together leads to
- * the concluson that RtlRandom saves the value in some variable,
+ * the conclusion that RtlRandom saves the value in some variable,
  * like in the following algorithm:
  *
  * result = saved_value;
diff --git a/dlls/ntdll/tests/rtlstr.c b/dlls/ntdll/tests/rtlstr.c
index 61da443abfb..5239de07e04 100644
--- a/dlls/ntdll/tests/rtlstr.c
+++ b/dlls/ntdll/tests/rtlstr.c
@@ -1282,7 +1282,7 @@ static const str2int_t str2int[] = {
     { 0, "0o7",                   7, STATUS_SUCCESS}, /* one digit octal */
     { 0, "0o8",                   0, STATUS_SUCCESS}, /* empty octal */
     { 0, "0o",                    0, STATUS_SUCCESS}, /* empty octal */
-    { 0, "0d1011101100",          0, STATUS_SUCCESS}, /* explizit decimal with 0d */
+    { 0, "0d1011101100",          0, STATUS_SUCCESS}, /* explicit decimal with 0d */
     { 0, "x89abcdef",             0, STATUS_SUCCESS}, /* Hex with lower case digits a-f (x-notation) */
     { 0, "xFEDCBA00",             0, STATUS_SUCCESS}, /* Hex with upper case digits A-F (x-notation) */
     { 0, "-xFEDCBA00",            0, STATUS_SUCCESS}, /* Negative Hexadecimal (x-notation) */
diff --git a/dlls/ntdll/tests/string.c b/dlls/ntdll/tests/string.c
index ce5892a77fa..4a7a497b6a3 100644
--- a/dlls/ntdll/tests/string.c
+++ b/dlls/ntdll/tests/string.c
@@ -859,7 +859,7 @@ static const str2long_t str2long[] = {
     { "0o7",                   0   }, /* one digit octal */
     { "0o8",                   0   }, /* empty octal */
     { "0o",                    0   }, /* empty octal */
-    { "0d1011101100",          0   }, /* explizit decimal with 0d */
+    { "0d1011101100",          0   }, /* explicit decimal with 0d */
     { "x89abcdef",             0   }, /* Hex with lower case digits a-f (x-notation) */
     { "xFEDCBA00",             0   }, /* Hex with upper case digits A-F (x-notation) */
     { "-xFEDCBA00",            0   }, /* Negative Hexadecimal (x-notation) */