Not sure if it's a hardware problem causing this, but I can't seem to find a general troubleshooting forum, so this will have to do.
For some reason my computer restarts itself every now and then. :S It all started somewhere around the time when I installed Daemon tools, and since my dad has a friend who encountered the same problems, but fixed them by uninstalling daemon tools, I thought that would be the answer for me too. However, this was not the case.
I've uninstalled daemon tools and gone through the registry and deleted every little trace of the cursed program, but it still restarts itself.
I've reformatted the computer a few times, and no anti virus programs seem to be able to find a virus, so I'm suspecting it's a hardware error.
Now, I'm a nerd. I'll happily admit that. But for some strange reason, I no absolutely nothing about hardware. Hell, I've never even opened a computer (well... One, but that was just because I wanted to smash it.)
Is there any relatively simple way of finding out what exactly is causing my problem? My first thought was that it was a fan broken, so that it would overheat. I suspected this because it restarted itself more frequently the more you used it (maybe because it was getting warmer?). But I downloaded a program to check on the fans, but they indicated that both fans were working at 100% efficiency, and that my computer wasn't very hot.

So, any ideas? I'll be happy to provide you with any information you may need.

My PC specs are:
AMD Athlon 1.40ghz
nVidia GeForce 3 Ti 200
512mb ram
Windows XP professional
Don't know about the motherboard. As you might understand, I didn't build the computer :P

It could be a problem with faulty RAM. Open the PC and see if your 512MB RAM is made up of a pair of 256MB modules. If it is, great. You can take one out and run it on 256MB for a while to see if the problem is resolved. If it is not, you can fit the other module instead to see if that helps. If neither makes any difference, fit both modules back in.

If you only have one RAM module, download a freeware memory checking utility such as MemCheck86. Follow the instructions on how to use it (some require you to make a boot disk) and then run the memory checker for a while during the day at some point when you can keep checking on its progress. The instructions should give some kind of guidance regarding the number of errors that are acceptable. If the log tells you that the RAM has significantly more errors than expected, then replace the RAM with a new module and, hopefully, that will sort it.

Note that, when working inside your PC, you risk damaging sensitive electronic components through the discharge of static electricity from your body and clothes. Read up on how to avoid ElectroStatic Discharge (ESD) in the Articles section of the forum before you touch anything inside the case.

Let us know how you get on

Thanks for the reply, but I've ordered new hardware for my computer (for example, new RAM) so there's no need for me to go in and destroy the computer just yet.
I was pretty sure that it was the ram that was damaged aswell, but I didn't know how to check it until a friend of mine told me about memorytest 86 or whatever it was called. Unfortunantly I'm out of CDs, so I can't make a bootdisc xD

But anyway, thanks for your reply.