IE/ Firefox Browser closes randomly, computer shuts down randomly?

There are several problems that I'll address here:

1. My internet browsers close randomly/unexpectedly. I thought it might be a problem with IE so I switched to Firefox, but it stills happens. It happens more frequently when the computer first starts up, but every 3 minutes or so the browser closes.

2. The computer itself restarts randomly. I've changed my power settings but it still does it. Is there any fix or any suggested power settings? Whenever the computer comes back on I get a message "Windows has recovered from a serious error."

3. I can't change font sizes in Microsoft Works Word Processor or the program will freeze.

I've googled all of the problems and I've found people asking for help but no one knows a solution. I really hope you guys can help!

I've also ran Avast! virus scan, Spyware Doctor, Ad-Aware, Ace Utilities, etc, and nothing comes up, so I doubt it's any form of spyware and if it is a virus it's a very elusive one.

IE/ Firefox Browser closes randomly, computer shuts down randomly?computer virus

Try one of these tools...

http://blogs.techrepublic.com.com/10thin...

You've got a malware problem, probably a rootkit.

If none of the tools in that article help you, you will need to reformat and reinstall....

sorry, I wish I had better news