diff --git a/dlls/comctl32/header.c b/dlls/comctl32/header.c
index 1d4f1fdb5e7..63f91d82c1a 100644
--- a/dlls/comctl32/header.c
+++ b/dlls/comctl32/header.c
@@ -1829,7 +1829,7 @@ HEADER_MouseMove (HWND hwnd, WPARAM wParam, LPARAM lParam)
 		HEADER_DrawTrackLine (hwnd, hdc, infoPtr->xOldTrack);
 		ReleaseDC (hwnd, hdc);
                 iTrackWidth = infoPtr->xOldTrack - infoPtr->items[infoPtr->iMoveItem].rect.left;
-                /* FIXME: should stop tracking if HDN_TRACK returnes TRUE */
+                /* FIXME: should stop tracking if HDN_TRACK returns TRUE */
                 HEADER_SendNotifyWithIntFieldT(hwnd, HDN_TRACKW, infoPtr->iMoveItem, HDI_WIDTH, iTrackWidth);
 	    }
 
diff --git a/dlls/comctl32/listview.c b/dlls/comctl32/listview.c
index d99b1e2d94d..108d0556a64 100644
--- a/dlls/comctl32/listview.c
+++ b/dlls/comctl32/listview.c
@@ -5146,7 +5146,7 @@ static HIMAGELIST LISTVIEW_GetImageList(LISTVIEW_INFO *infoPtr, INT nImageList)
  * [I] hwnd : window handle
  * [IO] lpLVItem : item info
  * [I] isW : if TRUE, then lpLVItem is a LPLVITEMW,
- *           if FALSE, the lpLVItem is a LPLVITEMA.
+ *           if FALSE, then lpLVItem is a LPLVITEMA.
  *
  * NOTE:
  *   This is the internal 'GetItem' interface -- it tries to
@@ -5203,7 +5203,7 @@ static BOOL LISTVIEW_GetItemT(LISTVIEW_INFO *infoPtr, LPLVITEMW lpLVItem, BOOL i
     {
 	dispInfo.item.state = 0;
 
-	/* apprently, we should not callback for lParam in LVS_OWNERDATA */
+	/* apparently, we should not callback for lParam in LVS_OWNERDATA */
 	if ((lpLVItem->mask & ~(LVIF_STATE | LVIF_PARAM)) || infoPtr->uCallbackMask)
 	{
 	    /* NOTE: copy only fields which we _know_ are initialized, some apps
@@ -5399,7 +5399,7 @@ static BOOL LISTVIEW_GetItemT(LISTVIEW_INFO *infoPtr, LPLVITEMW lpLVItem, BOOL i
  * [I] hwnd : window handle
  * [IO] lpLVItem : item info
  * [I] isW : if TRUE, then lpLVItem is a LPLVITEMW,
- *           if FALSE, the lpLVItem is a LPLVITEMA.
+ *           if FALSE, then lpLVItem is a LPLVITEMA.
  *
  * NOTE:
  *   This is the external 'GetItem' interface -- it properly copies
@@ -6630,7 +6630,7 @@ fail:
  * [I] infoPtr : valid pointer to the listview structure
  * [I] nColumn : column index
  * [I] lpColumn : column attributes
- * [I] isW: if TRUE, the lpColumn is a LPLVCOLUMNW, else it is a LPLVCOLUMNA
+ * [I] isW: if TRUE, then lpColumn is a LPLVCOLUMNW, else it is a LPLVCOLUMNA
  *
  * RETURN:
  *   SUCCESS : TRUE
diff --git a/dlls/comctl32/tests/listview.c b/dlls/comctl32/tests/listview.c
index dd99df9e588..e96ad26dc85 100644
--- a/dlls/comctl32/tests/listview.c
+++ b/dlls/comctl32/tests/listview.c
@@ -147,7 +147,7 @@ static void test_checkboxes(void)
     r = SendMessage(hwnd, LVM_GETITEMA, 0, (LPARAM) &item);
     ok(item.state == 0x1ccc, "state %x\n", item.state);
 
-    /* Now add an item without specifying a state and check that it's state goes to 0x1000 */
+    /* Now add an item without specifying a state and check that its state goes to 0x1000 */
     item.iItem = 2;
     item.mask = LVIF_TEXT;
     item.state = 0;
@@ -161,7 +161,7 @@ static void test_checkboxes(void)
     r = SendMessage(hwnd, LVM_GETITEMA, 0, (LPARAM) &item);
     ok(item.state == 0x1000, "state %x\n", item.state);
 
-    /* Add a further item this time specifying a state and still it's state goes to 0x1000 */
+    /* Add a further item this time specifying a state and still its state goes to 0x1000 */
     item.iItem = 3;
     item.mask = LVIF_TEXT | LVIF_STATE;
     item.stateMask = 0xffff;
diff --git a/dlls/crypt32/tests/sip.c b/dlls/crypt32/tests/sip.c
index 6fa6b99b071..826425198e6 100644
--- a/dlls/crypt32/tests/sip.c
+++ b/dlls/crypt32/tests/sip.c
@@ -149,9 +149,9 @@ static void test_SIPRetrieveSubjectGUID(void)
     ok (GetLastError() == ERROR_INVALID_PARAMETER,
         "Expected ERROR_INVALID_PARAMETER, got %ld.\n", GetLastError());
 
-    /* Test with a non-existent file (hopefully) */
+    /* Test with a nonexistent file (hopefully) */
     SetLastError(0xdeadbeef);
-    /* Set subject to something other than zero's */
+    /* Set subject to something other than zeros */
     memset(&subject, 1, sizeof(GUID));
     ret = CryptSIPRetrieveSubjectGuid(deadbeef, NULL, &subject);
     ok ( !ret, "Expected CryptSIPRetrieveSubjectGuid to fail\n");
diff --git a/dlls/oleaut32/ungif.c b/dlls/oleaut32/ungif.c
index 97e8cf1da3f..7ee6e83f785 100644
--- a/dlls/oleaut32/ungif.c
+++ b/dlls/oleaut32/ungif.c
@@ -713,9 +713,9 @@ DGifGetPrefixChar(GifPrefixType *Prefix,
 
 /******************************************************************************
  * The LZ decompression input routine:
- * This routine is responsable for the decompression of the bit stream from
+ * This routine is responsible for the decompression of the bit stream from
  * 8 bits (bytes) packets, into the real codes.
- * Returns GIF_OK if read succesfully.
+ * Returns GIF_OK if read successfully.
  *****************************************************************************/
 static int
 DGifDecompressInput(GifFileType * GifFile,
@@ -767,7 +767,7 @@ DGifDecompressInput(GifFileType * GifFile,
  * This routines read one gif data block at a time and buffers it internally
  * so that the decompression routine could access it.
  * The routine returns the next byte from its internal buffer (or read next
- * block in if buffer empty) and returns GIF_OK if succesful.
+ * block in if buffer empty) and returns GIF_OK if successful.
  *****************************************************************************/
 static int
 DGifBufferedInput(GifFileType * GifFile,
diff --git a/dlls/setupapi/tests/devinst.c b/dlls/setupapi/tests/devinst.c
index 5f02991fd14..41d32ec4988 100644
--- a/dlls/setupapi/tests/devinst.c
+++ b/dlls/setupapi/tests/devinst.c
@@ -90,7 +90,7 @@ static void test_SetupDiOpenClassRegKeyExA(void)
     static const CHAR guidString[] = "{6a55b5a4-3f65-11db-b704-0011955c2bdb}";
     HKEY hkey;
 
-    /* Check return value for non-existent key */
+    /* Check return value for nonexistent key */
     hkey = pSetupDiOpenClassRegKeyExA(&guid, KEY_ALL_ACCESS,
         DIOCR_INSTALLER, NULL, NULL);
     ok(hkey == INVALID_HANDLE_VALUE,
diff --git a/dlls/wined3d/surface.c b/dlls/wined3d/surface.c
index 3146475a70f..786039656fc 100644
--- a/dlls/wined3d/surface.c
+++ b/dlls/wined3d/surface.c
@@ -2864,7 +2864,7 @@ HRESULT WINAPI IWineD3DSurfaceImpl_BltFast(IWineD3DSurface *iface, DWORD dstx, D
         DstRect.right = dstx + SrcRect.right - SrcRect.left;
         DstRect.bottom = dsty + SrcRect.bottom - SrcRect.top;
 
-        /* Convert BltFast flags into Btl ones because it is called from SurfaceImpl_Blt aswell */
+        /* Convert BltFast flags into Btl ones because it is called from SurfaceImpl_Blt as well */
         if(trans & DDBLTFAST_SRCCOLORKEY)
             Flags |= DDBLT_KEYSRC;
         if(trans & DDBLTFAST_DESTCOLORKEY)
diff --git a/dlls/wined3d/vertexbuffer.c b/dlls/wined3d/vertexbuffer.c
index 5046d42b681..71106a78956 100644
--- a/dlls/wined3d/vertexbuffer.c
+++ b/dlls/wined3d/vertexbuffer.c
@@ -241,7 +241,7 @@ inline BOOL WINAPI IWineD3DVertexBufferImpl_FindDecl(IWineD3DVertexBufferImpl *T
      * If some stuff does not exist in the buffer, then lpData, dwStride and dwType are memsetted to 0. So if the semantic didn't exist before
      * and does not exist now all 3 values will be equal(=0).
      *
-     * Checking the lpData field alone is not enought, because data may appear at offset 0 in the buffer. This is the same location as nonexistant
+     * Checking the lpData field alone is not enough, because data may appear at offset 0 in the buffer. This is the same location as nonexistent
      * data uses, so we have to check the type and stride too. Colors can be at offset 0 too, because it is perfectly fine to render from 2 or more
      * buffers at the same time and get the position from one and the color from the other buffer.
      */
diff --git a/dlls/winex11.drv/opengl.c b/dlls/winex11.drv/opengl.c
index c6f5a18d2ba..ad2c938e691 100644
--- a/dlls/winex11.drv/opengl.c
+++ b/dlls/winex11.drv/opengl.c
@@ -403,7 +403,7 @@ LOAD_FUNCPTR(glPixelStorei)
      * 8762 drivers support 1.3 for the server and 1.4 for the client and they support lots of extensions.
      * Unfortunately it is much more complicated for Mesa/DRI-based drivers and ATI's drivers.
      * Both sets of drivers report a server version of 1.2 and the client version can be 1.3 or 1.4.
-     * Further in case of atleast ATI's drivers one crucial extension needed for our pixel format code
+     * Further, in case of at least ATI's drivers, one crucial extension needed for our pixel format code
      * is only available in the list of server extensions and not in the client list.
      *
      * The versioning checks below try to take into account the comments from above.
@@ -2029,7 +2029,7 @@ GLboolean WINAPI X11DRV_wglChoosePixelFormatARB(HDC hdc, const int *piAttribILis
     int tmp_vis_id;
 
     int pfmt_it = 0;
-    int offscreen_index = 1; /* Start at one because we allways have a main visual at iPixelFormat=1 */
+    int offscreen_index = 1; /* Start at one because we always have a main visual at iPixelFormat=1 */
 
     TRACE("(%p, %p, %p, %d, %p, %p): hackish\n", hdc, piAttribIList, pfAttribFList, nMaxFormats, piFormats, nNumFormats);
     if (NULL != pfAttribFList) {
@@ -2103,7 +2103,7 @@ GLboolean WINAPI X11DRV_wglChoosePixelFormatARB(HDC hdc, const int *piAttribILis
             /* The format of Wine's main visual is stored at index 1 of our WGL format table.
             * At higher indices we store offscreen rendering formats (visualid=0). Below we calculate
             * the index of the offscreen format. We do this by counting the number of offscreen formats
-            * which we see upto reaching our target format. */ 
+            * which we see until we reach our target format. */ 
             if(tmp_vis_id == 0)
                 offscreen_index++;