My computer frequently hangs .the screen jamms and cpu stops responding.alt+ctrl+del doesnot work.also restart does not work most often.I have to press restart multiple times.even on restartin it gets hanged .
My config:-
Processor:- amd sempron (999Mhz)
Ram:- 1256 mb
Hard disk :-80 gb
Os:- windows xp sp2
I have formatted my PC 8 to 10 times but problem still persists.
I have installed avast antivirus,pctools firewall,pctool spyware doctor.
I regularly repair my registry using registry mechanic.
Is this virus problem or smethin else?