If you don't have time to try different solutions, reinstalling Windows may be your best solution. Make backup copies of your important data first. If you're running 2000 (and I assume XP as well) you may be able to bootup with your Windows CD and selecr repair your existing Windows. I just had to do this last week. All programs were intact but I lost some settings and my email. Searched out backup copies of the mail & everything is fine. Reinstalling Windows, Poser and the update should fix any software problems. You might want to download a new copy of the Poser update - conceivable yours got damaged somehow. If you still have problems after that with your system, it might be flaky hardware.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken