hw 2 safley ovrclock humin?

so my frend is down wit real bad viruz, i run vairuz scan norton 720 and it sey mayb it spywear. so i reserch on internt abott this and i find that overclok help kill varius. but problm is when fried is overclockd his temprature rise to abuv 40 degrease cellcius. frend cannot aford lickwid cooling, and high tempurature is not gud for him. so hao to strafely overclock to kill warios withut kill freind? help is much apreciate, mutha is very angshus.