Today a friend called, asking if I had any idea why his Windows XP machine did not display any picture miniature in the "My Pictures" folder anymore. He had already tried to reset file type associations and some other experiments, but without any luck. Moreover using JPG files as desktop background did not work anymore.
This led us to the solution. First we made sure that the patch was uninstalled by issuing the following command:
If it tells you, the program is not installed currently, you should be able to remove it from the "Add/Remove Software" control panel applet or by running "c:\Program Files\WindowMetafile\Fixunins000.exe".
Finally we re-registered the Windows picture and fax viewer library by issuing this commands:
regsvr32 -u %windir%\system32\shimgvw.dll regsvr32 %windir%\system32\shimgvw.dll
This should re-enable previews and also restore the desktop background functions.