A temporary WMF Exploit patch is available. Started reading about it on Steve Gibson's site: More about this WMF Patch can be found on the author's site (Ilfak Guilfanov):
Windows WMF Metafile Vulnerability HotFix
http://www.hexblog.com/2005/12/wmf_vuln.html
Ilfak has also written a little utility named:Tip: For those of you that have used the CMD:
regsvr32 -u shimgvw.dll
you can now run the CMD:
regsvr32 shimgvw.dll
to restore the "Thumbnail" view in Windows Explorer and Window's Image and FAX viewer.

Note: An ongoing discussion about this exploit can be vound in the following VirtualDr thread:
New Windows Metafile (WMF) 0-day exploit in the wild
http://discussions.virtualdr.com/sho...d.php?t=199345