Hi HankMC,
I've upgraded 3 machines without problems, and you need it to even get into Windows update. The updates do take a long time, each time you update it seems the update needs an update, but you do eventually get to the point where it's all current. It's especially important right now. MS released an update a couple of days back, somebody apparently hacked a Dutch Certificate Authority, Diginotar, and that gives him the ability to generate false but apparently valid certificates for websites, drivers, etc. He also claimed that he's gotten into GlobalSign and was even claiming that he could impersonate Windows Update itself, though that seems to not be possible. MS issued an update 2 days ago or so that invalidated the Dutch CA entirely, knocked most of the Dutch government offline in the process, and they'll invalidate any other CAs he might he might get into as time goes along. It's a bad time to not be current, and you can't even get into Windows Update with XP anymore without SP3.
Best regards,
- Bob
The StickWorks
http://www.stickworks.com