If you have icons that are not displaying correctly (for example, showing a different icon), you may need to rebuild Windows’ icon cache. This does not change any icons, but only clears the cache to get rid of corrupt information. After clearing the icon cache, you may want to increase its size to prevent future problems. Instructions are provided for both Windows Vista and Windows XP.
Windows Vista:
To rebuild the Vista icon cache, download and run this file [1].
To increase the maximum size of the icon cache, download and run this file [2].
Windows XP:
To rebuild the XP icon cache, download and run this file [3].
To increase the maximum size of the icon cache, download and run this file [2].