Windows maintains a cache of the images of your Desktop icons, so it doesn’t have to extract them from the corresponding program every time. If this cache is too small, Desktop icons may display improperly or show the wrong program’s icons. You can adjust the size of the cache by going into your register. Navigate to HKEY_LOCAL_MACHINE | SOFTWARE | Microsoft | Windows | CurrentVersion | Explorer. Add the following registry DWORD value called MaxCachedIcons. Give it a DWORD value of 4096.

If that does not help, set it to a higher value. You may need to force Windows to reread the cached icons after you increase the cache size. To do this, right-click on the Desktop, choose Properties, and click on the Appearance tab. Select Icon in the pull-down list labeled Item. Set the icon size to one pixel larger (probably to 33) and click Apply. Then set its size back to its previous value and click OK.