I'm using this to schedule the task.

code:
   shell '%COMSPEC% /c at 04:00 /interactive /every:M,T,W,Th,F,S ""%WINDIR%\wkix32.exe"" ""winexit.kix""
This works great on an XP worksatation, but the 2000 workstation fails.

I'm using SMS to copy the files to the workstations, so it can run with admin rights.