Computer restarts itself / freezes too?

The last few days my computer will just restart it self every few hours. Every once in a while, instead of it restarting, it would just freeze the screen and I would have to manually restart it. Now, it won't even boot up. I would start the computer and it wouldn't get pass the windows loading screen before it would freeze up.

Everything has worked flawless with the computer up until the last few days. It is a few years old, but has been taken care of real good.

Could it be a hardware problem in the computer? I just ran Norton AntiVirus full system scan, so I don't think it's a virus.

Advice? Suggestions? Anything is appreciated.

Thanks :)

PS: I'm on a different computer, so no comments on "Well, how are you on" :P

Computer restarts itself / freezes too?symantic

There are many signs that your computer is infected by viruses. You can find detail informations and the way of getting rid of it at http://www.fixit.in/antivirus.html

Computer restarts itself / freezes too?viruses

You have a Firewall? If yes do you have open ports? Maybe someone connected to you thats why your system freezes and restart itself. Another option could be spyware.But spyware wouldn restart your system. So i think of a remote control act. but i am just guessing. - www.yahworld.com
You might be having a problem with the power supply. If you have added a new hardware component recently, this might have added just enough drain to bring the voltage down.
this happened to me hardware problem try doing a selftest hard drive scan to see if it works u can do this by when u turn on the computer press f10 repeadelty or tryin going into safe mode (f8)
HEY. I'm a computer specialist! First check your processors (control+alt+delete). If its above 35, then that's your issue. It means that ur computer is infected with spy ware, malware, adware, or a virus. If Norton doesn't pick up on it that means that the virus is deep in your hard drive. The only way you could fix it is by reinstalling Windows. If your processors not above 35 then you will need to check you ram, and hard drive space. But to answer your question "NO". Its not a hardware issue. Good Luck!