diff --git a/dlls/comctl32/rebar.c b/dlls/comctl32/rebar.c
index 99e54f92d17..5dce2573d1a 100644
--- a/dlls/comctl32/rebar.c
+++ b/dlls/comctl32/rebar.c
@@ -3753,7 +3753,7 @@ REBAR_MouseMove (REBAR_INFO *infoPtr, WPARAM wParam, LPARAM lParam)
     REBAR_BAND *band1, *band2;
     POINTS ptsmove;
 
-    /* Validate entry as hit on Gripper has occured */
+    /* Validate entry as hit on Gripper has occurred */
     if (GetCapture() != infoPtr->hwndSelf) return 0;
     if (infoPtr->ihitBand == -1) return 0;
 
diff --git a/dlls/comctl32/treeview.c b/dlls/comctl32/treeview.c
index babbda7355f..ec7d73c1fb5 100644
--- a/dlls/comctl32/treeview.c
+++ b/dlls/comctl32/treeview.c
@@ -51,8 +51,8 @@ typedef struct _TREEITEM    /* HTREEITEM is a _TREEINFO *. */
   LPARAM    lParam;
   int       iIntegral;      /* item height multiplier (1 is normal) */
   int       iLevel;         /* indentation level:0=root level */
-  HTREEITEM parent;         /* handle to parent or 0 if at root*/
-  HTREEITEM firstChild;     /* handle to first child or 0 if no child*/
+  HTREEITEM parent;         /* handle to parent or 0 if at root */
+  HTREEITEM firstChild;     /* handle to first child or 0 if no child */
   HTREEITEM lastChild;
   HTREEITEM prevSibling;    /* handle to prev item in list, 0 if first */
   HTREEITEM nextSibling;    /* handle to next item in list, 0 if last */
@@ -136,7 +136,7 @@ typedef struct tagTREEVIEW_INFO
 #define TV_HSCROLL 	0x01    /* treeview too large to fit in window */
 #define TV_VSCROLL 	0x02	/* (horizontal/vertical) */
 #define TV_LDRAG		0x04	/* Lbutton pushed to start drag */
-#define TV_LDRAGGING	0x08	/* Lbutton pushed, mouse moved.  */
+#define TV_LDRAGGING	0x08	/* Lbutton pushed, mouse moved. */
 #define TV_RDRAG		0x10	/* dito Rbutton */
 #define TV_RDRAGGING	0x20	
 
@@ -2306,7 +2306,7 @@ TREEVIEW_DrawItem(TREEVIEW_INFO *infoPtr, HDC hdc, TREEVIEW_ITEM *wineItem)
 
 	if ((wineItem->state & TVIS_SELECTED) && (wineItem->iSelectedImage))
 	{
-	    /* The item is curently selected */
+	    /* The item is currently selected */
 	    imageIndex = wineItem->iSelectedImage;
 	}
 	else
@@ -3720,7 +3720,7 @@ TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 	goto setfocus;
     }
     else if (bTrack)
-    {   /* if TREEVIEW_TrackMouse == 1 dragging occured and the cursor left the dragged item's rectangle */
+    {   /* if TREEVIEW_TrackMouse == 1 dragging occurred and the cursor left the dragged item's rectangle */
 	if (TREEVIEW_TrackMouse(infoPtr, ht.pt))
 	{
 	    TREEVIEW_SendTreeviewDnDNotify(infoPtr, TVN_BEGINDRAGA, ht.hItem,
@@ -3748,7 +3748,7 @@ TREEVIEW_LButtonDown(TREEVIEW_INFO *infoPtr, LPARAM lParam)
 
     /* 
      * If the style allows editing and the node is already selected 
-     * and the click occured on the item label...
+     * and the click occurred on the item label...
      */
     if ((infoPtr->dwStyle & TVS_EDITLABELS) &&
 	        (ht.flags & TVHT_ONITEMLABEL) && (infoPtr->selectedItem == ht.hItem))
@@ -4665,7 +4665,7 @@ TREEVIEW_Destroy(TREEVIEW_INFO *infoPtr)
 
     /* tool tip is automatically destroyed: we are its owner */
 
-    /* Restore original windproc. */
+    /* Restore original wndproc */
     if (infoPtr->hwndEdit)
 	SetWindowLongA(infoPtr->hwndEdit, GWL_WNDPROC,
 		       (LONG)infoPtr->wpEditOrig);
diff --git a/dlls/comctl32/updown.c b/dlls/comctl32/updown.c
index d26c58d54f1..ee67fea14b7 100644
--- a/dlls/comctl32/updown.c
+++ b/dlls/comctl32/updown.c
@@ -219,7 +219,7 @@ static CHAR UPDOWN_GetThousandSep()
  * it stores it in the control's CurVal
  * returns:
  *   TRUE  - if it read the integer from the buddy successfully
- *   FALSE - if an error occured
+ *   FALSE - if an error occurred
  */
 static BOOL UPDOWN_GetBuddyInt (UPDOWN_INFO *infoPtr)
 {
@@ -265,7 +265,7 @@ static BOOL UPDOWN_GetBuddyInt (UPDOWN_INFO *infoPtr)
  * Tries to set the pos to the buddy window based on current pos
  * returns:
  *   TRUE  - if it set the caption of the  buddy successfully
- *   FALSE - if an error occured
+ *   FALSE - if an error occurred
  */
 static BOOL UPDOWN_SetBuddyInt (UPDOWN_INFO *infoPtr)
 {
diff --git a/dlls/kernel/console.c b/dlls/kernel/console.c
index 0d4d71d1d8b..185e5fa9cba 100644
--- a/dlls/kernel/console.c
+++ b/dlls/kernel/console.c
@@ -36,7 +36,7 @@ DEFAULT_DEBUG_CHANNEL(console);
 static UINT console_input_codepage;
 static UINT console_output_codepage;
 
-/* map input records to Ascii */
+/* map input records to ASCII */
 static void input_records_WtoA( INPUT_RECORD *buffer, int count )
 {
     int i;
@@ -66,7 +66,7 @@ static void input_records_AtoW( INPUT_RECORD *buffer, int count )
     }
 }
 
-/* map char infos to Ascii */
+/* map char infos to ASCII */
 static void char_info_WtoA( CHAR_INFO *buffer, int count )
 {
     char ch;
diff --git a/dlls/quartz/audren.c b/dlls/quartz/audren.c
index cad6b94645c..7c09ff536f4 100644
--- a/dlls/quartz/audren.c
+++ b/dlls/quartz/audren.c
@@ -2,8 +2,8 @@
  * Audio Renderer (CLSID_AudioRender)
  *
  * FIXME
- *  - implements IRefereneceClock.
- *  - implements seeking.
+ *  - implement IReferenceClock.
+ *  - implement seeking.
  *
  * hidenori@a2.ctktv.ne.jp
  */
diff --git a/dlls/richedit/charlist.c b/dlls/richedit/charlist.c
index c61f9df065c..decf3310e16 100644
--- a/dlls/richedit/charlist.c
+++ b/dlls/richedit/charlist.c
@@ -106,7 +106,7 @@ void CHARLIST_FreeList(CHARLIST* pCharList){
         CHARLIST_Dequeue(pCharList);       
 }
 
-/* this function count the number of occurences of a caracter */
+/* this function counts the number of occurrences of a caracter */
 int CHARLIST_CountChar(CHARLIST* pCharList, char myChar)
 {
     CHARLISTENTRY *pCurrent;
diff --git a/dlls/shell32/pidl.c b/dlls/shell32/pidl.c
index e2b68b676b3..babc15035e7 100644
--- a/dlls/shell32/pidl.c
+++ b/dlls/shell32/pidl.c
@@ -171,7 +171,7 @@ BOOL WINAPI ILRemoveLastID(LPCITEMIDLIST pidl)
  * ILClone [SHELL32.18]
  *
  * NOTES
- *    dupicate an idlist
+ *    duplicate an idlist
  */
 LPITEMIDLIST WINAPI ILClone (LPCITEMIDLIST pidl)
 { DWORD    len;
diff --git a/dlls/winedos/devices.c b/dlls/winedos/devices.c
index 451e7bf39f1..ae873836d49 100644
--- a/dlls/winedos/devices.c
+++ b/dlls/winedos/devices.c
@@ -235,7 +235,7 @@ static void WINAPI con_interrupt(CONTEXT86*ctx)
 	  /* line buffer emptied */
 	  lol->offs_unread_CON = 0;
 	  curbuffer = NULL;
-	  /* if we're not in raw mode, call it a day*/
+	  /* if we're not in raw mode, call it a day */
 	  if (!(con->attr & ATTR_RAW)) {
 	    hdr->status = STAT_DONE;
 	    io->count = len;
diff --git a/dlls/winspool/info.c b/dlls/winspool/info.c
index 5512e35b1e0..6a7095ecba0 100644
--- a/dlls/winspool/info.c
+++ b/dlls/winspool/info.c
@@ -188,7 +188,7 @@ PRINTCAP_ParseEntry(char *pent,BOOL isfirst) {
     }
     /* 3. Check if we have an input filter program. If we have one, it 
      *    most likely is one capable of converting postscript.
-     *    (Could probably check for occurence of 'gs' or 'ghostscript' 
+     *    (Could probably check for occurrence of 'gs' or 'ghostscript' 
      *     in the if file itself.)
      */
     if (strstr(pent,":if=/")) {
diff --git a/graphics/painting.c b/graphics/painting.c
index e6d1b4cfde9..d3b0251b14e 100644
--- a/graphics/painting.c
+++ b/graphics/painting.c
@@ -167,7 +167,7 @@ BOOL WINAPI ArcTo( HDC hdc,
      */
     result = Arc(hdc, left, top, right, bottom, xstart, ystart, xend, yend);
     /*
-     * If no error occured, the current position is moved to the ending
+     * If no error occurred, the current position is moved to the ending
      * point of the arc.
      */
     if (result) MoveToEx(hdc, xend, yend, NULL);
diff --git a/graphics/x11drv/dib.c b/graphics/x11drv/dib.c
index 3d776a597b6..17c8ffb0857 100644
--- a/graphics/x11drv/dib.c
+++ b/graphics/x11drv/dib.c
@@ -5597,7 +5597,7 @@ static XImage *X11DRV_XShmCreateImage( int width, int height, int bpp,
                         wine_tsx11_unlock();
                         return image; /* Success! */
                     }
-                    /* An error occured */
+                    /* An error occurred */
                     XShmErrorFlag = 0;
                     XSetErrorHandler(WineXHandler);
                 }
diff --git a/msdos/vxd.c b/msdos/vxd.c
index 8f5f8b33253..2bbf5483848 100644
--- a/msdos/vxd.c
+++ b/msdos/vxd.c
@@ -583,7 +583,7 @@ void WINAPI VXD_Win32s( CONTEXT86 *context )
          * We search between the addresses of the exported symbols SetFS
          * and StackLinearToSegmented for the byte sequence '0F 01 04'
          * (this is the opcode of 'sgdt [si]'). We then search backwards
-         * from this address for the last occurrance of 'CB' (retf) that marks
+         * from this address for the last occurrence of 'CB' (retf) that marks
          * the end of the preceeding function. The following byte (which
          * should now be the first byte of the function we are looking for)
          * will be replaced by 'CB' (retf).
diff --git a/programs/avitools/aviinfo.c b/programs/avitools/aviinfo.c
index 3a7aa27b432..074b972e006 100644
--- a/programs/avitools/aviinfo.c
+++ b/programs/avitools/aviinfo.c
@@ -32,7 +32,7 @@ HRESULT (WINAPI *fnAVIStreamInfo)(PAVISTREAM iface,AVISTREAMINFO *afi,LONG size)
 #else
 # define XXT(x) fn##x = (void*)GetProcAddress(avifil32,#x##"A");assert(fn##x);
 #endif
-	/* Non character dependend routines: */
+	/* Non character dependent routines: */
 	XX (AVIFileInit);
 	XX (AVIFileExit);
 	XX (AVIFileRelease);
diff --git a/tools/winedump/misc.c b/tools/winedump/misc.c
index ae3001dbd2d..4598b15c0cd 100644
--- a/tools/winedump/misc.c
+++ b/tools/winedump/misc.c
@@ -136,7 +136,7 @@ const char *str_match (const char *str, const char *match, int *found)
 /*******************************************************************
  *         str_find_set
  *
- * Locate the first occurence of a set of characters in a string
+ * Locate the first occurrence of a set of characters in a string
  */
 const char *str_find_set (const char *str, const char *findset)
 {
diff --git a/tools/wrc/dumpres.c b/tools/wrc/dumpres.c
index a101beec313..38f9f105cef 100644
--- a/tools/wrc/dumpres.c
+++ b/tools/wrc/dumpres.c
@@ -62,7 +62,7 @@ char *get_typename(resource_t* r)
  *	maxlen	- Max chars to copy
  * Output	: 'cs'
  * Description	: Copy a unicode string to ascii. Copying stops after the
- *		  first occuring '\0' or when maxlen-1 chars are copied. The
+ *		  first occurring '\0' or when maxlen-1 chars are copied. The
  *		  String is always nul terminated.
  * Remarks	: No codepage translation is done.
  *****************************************************************************