computer restart once i scan computer

huh i m feeling very bad now something is getting wrong with my cpu
my computer ic sudenly restart once i run avira anitivus huh i don't what i have to do even i try to scan online virus scan bitdefender samething suddnely it goes to restart plz help me out from this matter so bad

 

any body here i suspect may be i read a hoax email that claiming if you forward this email u bill get will pay to you the problem start from that ..
using windows 2000 sp4

 

Hi z4u,

Did you open the case and check for dust buildup? Virus scans can place a considerable load on the system, and a system with dust buildup can get too hot and shut down when placed under such a load. Check that all of the fans are working too.

Once you've checked for and eliminated heat as a possibility, post a log from Deckards System Scanner if still having problems.

 

thanx bro finally u replied me i found out what's the cause but i need ur help to fix this error i do sfc /scannow but it still doesn't work but i recving blue screen with following and this file causing windrvnt.sys problem actually i installed folder lock software and then unistalled i believed this behaviour happen after i install this application i do google search and find out abt this file it's related with folder lock and i relazied that i have installed and unistalled this software after this problem apperas
here is error msg
stop 409f405c-windrvnt.sys
i need ur urgent reply otherwise i will have last option format
thank you
even i have deleted file windrvnt.sys
the problem stil remain same

 

well now system is okey afer i deleted folder lock all files from drives my system seems okey and it doesn't restart now i m now scanning for virus tq.

 

Glad to hear you found the problem.