Unwanted Closing of Programs

[Zimma0320]

Lately my computer is closing things on its own, while I'm in the middle of using them.  Whether it's Netscape, Winamp Music Player, or even my virus programs.  Things are just shutting down on its own.  I'm not sure of what to do to rectify this because I can't even scan my computer.  Anyone have a suggestion?  I'm using an AMD Athlon Processor XP 2400+ with Windows XP SP 2.  

[patio]

Are just the programs closing or is the machine itself shutting down ? ?

Try re-booting into Safemode and running all your protection scans...

patio.  8_

[Zimma0320]

I rebooted in Safe Mode so that I could finally run my scans.  I used norton antivirus, ewido, ad-aware, and spybot.  Upon rebooting my computer in normal mode now, the problem is still happening.  I came home and my AIM had shut itself off.  Netscape also just closed on its own.  My computer itself is not totally rebooting, just these applications.  Any other suggestions?

[Raptor]

Is Norton Anti virus still valid?

[Zimma0320]

I'm not sure what you mean...I have a one year subscription that ends at the end of this month, but as far as I know it's valid...

[Raptor]

And it detects absolutely no viruses?

Have you scanned in safe mode with System Restore turned off?