Which anti-virus is the less resource taker ever .. and still works fine.. i'am using AVIRA rite now but for some reasons even games like call of duty 1 are lagging which they were'nt used to do before.. on the other hands frame rates are many places have increased , i guess.. Like it hang for 1 second and then start working fine again.. do i need to defragment my disk? or its coz of the antivirus change? i used to use norton internet security before ( the resource eater )