I'm running Windows XP on a Dell Dimension 4800. We've had it for a while, obviously. Against my better judgment I took this puppy in to Geeksquad to check one problem and it came back with another that I believe is registry related: certain program installers/uninstallers lock up the computer that didn't use to lock it up. Clicking icons and buttons and even ctrl/alt/del do nothing, and nothing short of pulling the plug cures it. RAM use is normal when it happens, so I know nothing is eating all my RAM and causing a dramatic slowdown. It's been like this for a couple weeks, virus/spyware scans reveal nothing, system restore didn't cure the problem, and I'll be damned if I'm taking it back in to the people who may or may not have caused the issue in the first place (it's possible the problem started before the Geeksquad visit and just didn't rear its ugly head 'til afterward). Some fluke just turns it into a zombie. Here's a list of things that have caused the lockups so far: audacity sound software installer adobe flash player update for ie webroot spy sweeper update registry cleaning program uninstaller (didn't use it, found out it was bogus, but then I couldn't get rid of it and had to do a system restore just to be safe). When I run any of these, the computer locks up before it gives me any options. The only one that's really bothering me is the webroot update, being that it's for my spyware protection (its the program update, fortunately, not the definition update). Nobody else has posted a problem like this anywhere on the net that I can see: just issues regarding "windows locks up after installing sound card/video card/windows" and it's really irritating. So any suggestions of the problem's cause? If I can get around having to reformat again that would be great.