diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c
index 6797b1bdd0a..562ebaac4e6 100644
--- a/dlls/advapi32/tests/registry.c
+++ b/dlls/advapi32/tests/registry.c
@@ -423,7 +423,7 @@ static void test_enum_value(void)
     ok( val_count == 2 || val_count == 3, "val_count set to %d\n", val_count );
     ok( data_count == 7, "data_count set to %d instead of 7\n", data_count );
     ok( type == REG_SZ, "type %d is not REG_SZ\n", type );
-    /* v5.1.2600.0 (XP Home and Proffesional) does not touch value or data in this case */
+    /* v5.1.2600.0 (XP Home and Professional) does not touch value or data in this case */
     ok( !strcmp( value, "Te" ) || !strcmp( value, "xxxxxxxxxx" ), 
         "value set to '%s' instead of 'Te' or 'xxxxxxxxxx'\n", value );
     ok( !strcmp( data, "foobar" ) || !strcmp( data, "xxxxxxx" ), 
diff --git a/dlls/advpack/files.c b/dlls/advpack/files.c
index 7dc816f46bc..f351bb49521 100644
--- a/dlls/advpack/files.c
+++ b/dlls/advpack/files.c
@@ -514,7 +514,7 @@ HRESULT WINAPI DelNodeRunDLL32W(HWND hWnd, HINSTANCE hInst, LPWSTR cmdline, INT
     return res;
 }
 
-/* The following defintions were copied from dlls/cabinet/cabinet.h */
+/* The following definitions were copied from dlls/cabinet/cabinet.h */
 
 /* SESSION Operation */
 #define EXTRACT_FILLFILELIST  0x00000001
diff --git a/dlls/advpack/reg.c b/dlls/advpack/reg.c
index 2b1418ad5d4..bcb6cb9d596 100644
--- a/dlls/advpack/reg.c
+++ b/dlls/advpack/reg.c
@@ -210,7 +210,7 @@ static HRESULT write_predefined_strings(HMODULE hm, LPCWSTR ini_path)
  * substitution table, and executes the INF.
  *
  * PARAMS
- *   hm         [I] Module that contains the REGINST resouce.
+ *   hm         [I] Module that contains the REGINST resource.
  *   pszSection [I] The INF section to execute.
  *   pstTable   [I] Table of string substitutions.
  * 
diff --git a/dlls/avifil32/avifile.c b/dlls/avifil32/avifile.c
index b97fd783bd5..593cdf92a73 100644
--- a/dlls/avifil32/avifile.c
+++ b/dlls/avifil32/avifile.c
@@ -623,7 +623,7 @@ static HRESULT WINAPI IPersistFile_fnLoad(IPersistFile *iface,
   if (This->paf->hmmio != NULL)
     return AVIERR_ERROR; /* No reuse of this object for another file! */
 
-  /* remeber mode and name */
+  /* remember mode and name */
   This->paf->uMode = dwMode;
 
   len = lstrlenW(pszFileName) + 1;
@@ -951,7 +951,7 @@ static HRESULT WINAPI IAVIStream_fnSetFormat(IAVIStream *iface, LONG pos,
   if (This->lpFormat == NULL) {
     /* initial format */
     if (This->paf->dwMoviChunkPos != 0)
-      return AVIERR_ERROR; /* user has used API in wrong sequnece! */
+      return AVIERR_ERROR; /* user has used API in wrong sequence! */
 
     This->lpFormat = HeapAlloc(GetProcessHeap(), 0, formatsize);
     if (This->lpFormat == NULL)
@@ -1413,7 +1413,7 @@ static HRESULT AVIFILE_AddFrame(IAVIStreamImpl *This, DWORD ckid, DWORD size, DW
     break;
   };
 
-  /* first frame is alwasy a keyframe */
+  /* first frame is always a keyframe */
   if (This->lLastFrame == -1)
     flags |= AVIIF_KEYFRAME;
 
@@ -2226,7 +2226,7 @@ static HRESULT AVIFILE_SaveFile(IAVIFileImpl *This)
 
     /* ... some optional additional extra chunk for this stream ... */
     if (pStream->extra.lp != NULL && pStream->extra.cb > 0) {
-      /* the chunk header(s) are already in the strucuture */
+      /* the chunk header(s) are already in the structure */
       if (mmioWrite(This->hmmio, (HPSTR)pStream->extra.lp, pStream->extra.cb) != pStream->extra.cb)
 	return AVIERR_FILEWRITE;
     }
@@ -2332,7 +2332,7 @@ static HRESULT AVIFILE_SaveIndex(const IAVIFileImpl *This)
     return AVIERR_FILEWRITE;
 
   if (This->fInfo.dwFlags & AVIFILEINFO_ISINTERLEAVED) {
-    /* is interleaved -- write block of coresponding frames */
+    /* is interleaved -- write block of corresponding frames */
     LONG lInitialFrames = 0;
     LONG stepsize;
     LONG i;
diff --git a/dlls/avifil32/editstream.c b/dlls/avifil32/editstream.c
index 14d361e2a32..8b9eb552f2b 100644
--- a/dlls/avifil32/editstream.c
+++ b/dlls/avifil32/editstream.c
@@ -424,7 +424,7 @@ static HRESULT WINAPI IAVIEditStream_fnCut(IAVIEditStream*iface,LONG*plStart,
   if (plStart == NULL || plLength == NULL || *plStart < 0)
     return AVIERR_BADPARAM;
 
-  /* if asked for cutted part copy it before deleting */
+  /* if asked for cut part copy it before deleting */
   if (ppResult != NULL) {
     hr = IAVIEditStream_Copy(iface, plStart, plLength, ppResult);
     if (FAILED(hr))
@@ -620,7 +620,7 @@ static HRESULT WINAPI IAVIEditStream_fnPaste(IAVIEditStream*iface,LONG*plStart,
 	AVIFILE_ReadFrame(This, This->pStreams[0].pStream,
 			  This->pStreams[0].dwStart);
 
-	/* Check if we could convert the source streams to the disired format... */
+	/* Check if we could convert the source streams to the desired format... */
 	if (pEdit != NULL) {
 	  if (FAILED(AVIFILE_FindStreamInTable(pEdit, lStart, &pStream,
 					       &startPos, &streamNr, TRUE)))
diff --git a/dlls/avifil32/icmstream.c b/dlls/avifil32/icmstream.c
index 82536052d15..8ac2e33682f 100644
--- a/dlls/avifil32/icmstream.c
+++ b/dlls/avifil32/icmstream.c
@@ -558,7 +558,7 @@ static HRESULT WINAPI ICMStream_fnSetFormat(IAVIStream *iface, LONG pos,
     if (ICCompressBegin(This->hic, lpbi, This->lpbiOutput) != S_OK)
       return AVIERR_COMPRESSOR;
 
-    /* check if we need to restart decompresion also */
+    /* check if we need to restart decompression also */
     if (This->lKeyFrameEvery != 1 &&
 	(This->dwICMFlags & VIDCF_FASTTEMPORALC) == 0) {
       ICDecompressEnd(This->hic);
diff --git a/dlls/avifil32/wavfile.c b/dlls/avifil32/wavfile.c
index d3048d60318..2c60bf51f7d 100644
--- a/dlls/avifil32/wavfile.c
+++ b/dlls/avifil32/wavfile.c
@@ -574,7 +574,7 @@ static HRESULT WINAPI IPersistFile_fnLoad(IPersistFile *iface,
   if (This->hmmio != NULL)
     return AVIERR_ERROR; /* No reuse of this object for another file! */
 
-  /* remeber mode and name */
+  /* remember mode and name */
   This->uMode = dwMode;
 
   len = lstrlenW(pszFileName) + 1;
diff --git a/dlls/browseui/progressdlg.c b/dlls/browseui/progressdlg.c
index 63f51dddaef..be77edf2f31 100644
--- a/dlls/browseui/progressdlg.c
+++ b/dlls/browseui/progressdlg.c
@@ -46,7 +46,7 @@ WINE_DEFAULT_DEBUG_CHANNEL(browseui);
 #define CANCEL_MSG_LINE 2
 
 /* Note: to avoid a deadlock we don't want to send messages to the dialog
- * with the critical section held. Instead we only mark what fields shoud be
+ * with the critical section held. Instead we only mark what fields should be
  * updated and the dialog proc does the update */
 #define UPDATE_PROGRESS         0x1
 #define UPDATE_TITLE            0x2
diff --git a/dlls/cabinet/fci.c b/dlls/cabinet/fci.c
index db24ddc1aae..da06cb7bd28 100644
--- a/dlls/cabinet/fci.c
+++ b/dlls/cabinet/fci.c
@@ -75,7 +75,7 @@ typedef struct {
   cab_UBYTE versionMajor; /* 1 */
   cab_UWORD cFolders;     /* number of CFFOLDER entries in the cabinet*/
   cab_UWORD cFiles;       /* number of CFFILE entries in the cabinet*/
-  cab_UWORD flags;        /* 1=prev cab, 2=next cabinet, 4=reserved setions*/
+  cab_UWORD flags;        /* 1=prev cab, 2=next cabinet, 4=reserved sections*/
   cab_UWORD setID;        /* identification number of all cabinets in a set*/
   cab_UWORD iCabinet;     /* number of the cabinet in a set */
   /* additional area if "flags" were set*/
@@ -525,7 +525,7 @@ static BOOL fci_flushfolder_copy_cfdata(HFCI hfci, char* buffer, UINT cbReserveC
       split_block=TRUE;  /* In this case split_block is abused to store */
       /* the complete data block into the next cabinet and not into the */
       /* current one. Originally split_block is the indicator that a */
-      /* data block has been splitted across different cabinets. */
+      /* data block has been split across different cabinets. */
     } else {
 
       /* read CFDATA from p_fci_internal->handleCFDATA1 to cfdata*/
@@ -615,13 +615,13 @@ static BOOL fci_flushfolder_copy_cfdata(HFCI hfci, char* buffer, UINT cbReserveC
           strlen(p_fci_internal->pccab->szDisk)+1;
 
         savedUncomp = pcfdata->cbUncomp;
-        pcfdata->cbUncomp = 0; /* on splitted blocks of data this is zero */
+        pcfdata->cbUncomp = 0; /* on split blocks of data this is zero */
 
         /* if split_block==TRUE then the above while loop won't */
         /* be executed again */
         split_block=TRUE; /* split_block is the indicator that */
-                          /* a data block has been splitted across */
-                          /* diffentent cabinets.*/
+                          /* a data block has been split across */
+                          /* different cabinets.*/
       }
 
       /* This should never happen !!! */
@@ -799,7 +799,7 @@ static BOOL fci_flushfolder_copy_cfdata(HFCI hfci, char* buffer, UINT cbReserveC
 
         /* report status with pfnfcis about copied size of folder */
         if( (*pfnfcis)(statusFolder,
-            p_fci_internal->statusFolderCopied,/*cfdata.cbData(+revious ones)*/
+            p_fci_internal->statusFolderCopied,/*cfdata.cbData(+previous ones)*/
             p_fci_internal->statusFolderTotal, /* total folder size */
             p_fci_internal->pv) == -1) {
           fci_set_error( FCIERR_USER_ABORT, 0, TRUE );
@@ -1649,7 +1649,7 @@ static BOOL fci_flush_cabinet(
   cfheader.cFolders=p_fci_internal->cFolders;
   /* number of CFFILE entries in the cabinet */
   cfheader.cFiles=p_fci_internal->cFiles;
-  cfheader.flags=0;    /* 1=prev cab, 2=next cabinet, 4=reserved setions */
+  cfheader.flags=0;    /* 1=prev cab, 2=next cabinet, 4=reserved sections */
 
   if( p_fci_internal->fPrevCab ) {
     cfheader.flags = cfheadPREV_CABINET;
@@ -1904,7 +1904,7 @@ static BOOL fci_flush_cabinet(
     /* add optional reserved area */
 
     /* This allocation and freeing at each CFFolder block is a bit */
-    /* inefficent, but it's harder to forget about freeing the buffer :-). */
+    /* inefficient, but it's harder to forget about freeing the buffer :-). */
     /* Reserved areas are used seldom besides that... */
     if (cbReserveCFFolder!=0) {
       if(!(reserved = PFCI_ALLOC(hfci, cbReserveCFFolder))) {
@@ -2713,7 +2713,7 @@ BOOL __cdecl FCIAddFile(
  *
  * FCIFlushFolder completes the CFFolder structure under construction.
  *
- * All further data which is added by FCIAddFile will be associateed to
+ * All further data which is added by FCIAddFile will be associated to
  * the next CFFolder structure.
  *
  * FCIFlushFolder will be called by FCIAddFile automatically if the
diff --git a/dlls/cabinet/tests/extract.c b/dlls/cabinet/tests/extract.c
index 2cf5154b7af..156df177a9b 100644
--- a/dlls/cabinet/tests/extract.c
+++ b/dlls/cabinet/tests/extract.c
@@ -28,7 +28,7 @@
 #define MEDIA_SIZE          999999999
 #define FOLDER_THRESHOLD    900000
 
-/* The following defintions were copied from dlls/cabinet/cabinet.h
+/* The following definitions were copied from dlls/cabinet/cabinet.h
  * because they are undocumented in windows.
  */