hmmm...i have to correct me...
first question is : how many winmgmt.exe exists on ya system?
so do somethin like: dir /s c:\winmgnt.exe
i'm shure you will find more than one...
should be in
c:\WINNT\ServicePackFiles\i386\
c:\WINNT\system32\wbem
replace all found winmgmt.exe with the one stored in c:\WINNT\ServicePackFiles\i386\
this should help