No issue's here on Vista Ultimate(all Windows Updates installed).
If you believe that Windows updates created an issue, restore to an
image prior to the updates(using the cd) then install the Windows
updates one at time.
If you find an issue with an update you might consider posting it in the
Windows Update newsgroup instead of this 'general' Vista forum.
I used to be concerned with resources on some of the Symantec products
especially in XP(NIS 2006 and NSW2005 were huge hogs)..but that's just
not the case anymore in these designed for Vista applications(N360,
Ghost 12).
...winston
MS-MVP Windows Live Mail