Still on there? If you think it's some software issue, the old method is to trim all extras down, set the background to a single color and be brutal about all apps running.
That and what you read at
Hi guys, I've been having this problem for the past ~3 weeks. I'm just doing stuff on my PC and the mouse or keyboard stop responding at all. Videos on youtube also freeze as well. Apart from that, there's no apparent connection with the software or peripheral used at the time this happens; it could be any office software, or Firefox, multimedia player, etc. The screen doesn't show any action either except for Alpha Clock, a small application that's always on one corner and keeps going after everything else froze. Sometimes Alpha Clock also stops after a few minutes, some other times I just reset the PC right away and can't tell what could happen later. Windows' Toolbar does freeze along with all other activity though. As I said, online videos also stop playing.
Please help. I've been thinking it could be a RAM problem, what are your thoughts? The fans are all good. The PC is a 3+ year old Athlon Dual Core 2.61 GHz, 2GB RAM, Windows XP Home Edition w/Service Pack 3. Thank you very much for any hint that helps me solve this problem.