From: "Rich Gauszka" 

Vista Business ( MSDN ) running in Vmware Workstation 5.5.3.  ( no changes
or updates to VMware ) has required reactivation every time I've run
Windows Update. I'm in the 3rd 'your activation period has expired'
scenario right now. Since I've already activated twice already I've decided
to give up as not to use up my MSDN product keys with a braindead Vista
activation scheme

--- BBBS/NT v4.01 Flag-5