c:\windows\system32\wextract.exe (Win32 Cabinet Self-Extractor, by Microsoft) is being erroneously detected as Trojan.Vundo. do *NOT* remove it.
I was going to report this, but I see several others have beaten me to the MBAM forum:
http://www.malwarebytes.org/forums/index.php?showtopic=12131&pid=61652&mode=threaded&start=#entry61652
http://www.malwarebytes.org/forums/index.php?showtopic=11639
http://www.malwarebytes.org/forums/index.php?showtopic=12129
.
took them longer than usual... we've grown accustomed to "instantaneous" fixes from MBAM...
but it's been fixed with the release of database 1821