I've been having this problem on my Dell Vostro 400 XP SP2 for around 3 weeks now.
The PC boots up fine and then functions well as it has always done for a random period of time. Then it starts slowly freezing eventually giving me no control at all over the PC. The clock freezes at the time that the PC froze, and I have no control.
Occasionally, a loud long continuous beep is emitted from the CPU and I have once experienced the BSOD.
The annoying thing is that the freeze occurs at random times, regardless of what I'm doing at the moment. It can occur at any time period, maybe when I'm surfing the web or watching a video on YouTube. The fact that it's unpredictable makes it all the more difficult to figure out and makes it more annoying. I have typed all these symptoms into Google and even though I have found many people with the same problems, they don't seem to have been solved on any other forums, including one post on this website.
If anyone has any ideas for why this problem is occurring, I'd be glad to hear it. Thank you very much for your time.