brother mary ek friend k laptop main virus aa gya ha ,jab k laptop main orgnl vista install ha or woh xp karna chahta ha.lakin jab xp install krny k liye boot krty hain to system cd sy files chk krny k bad yeh option data ha k aap system ko antivirus sy scan krain or dobara try krain is k bad reboot krny ko kehta ha....... aap ka koi mashwarah plz????