My parents computer has been infected by a worm or other such virus i see warnings and anti virus protection updates but i didnt know which to trust as my real anti virus or if it was the virus trying to trick me. i have tried running all the virus scan on the computer. which includes Mcafee(from my isp) malware bytes,spybot search and destroy, and i also had mcafee site advisor on there, when i went to run malware bytes the virus deleted the exe file for it so no luck there when i went to reinstall it, it failed, i tried installing avg cause that never failed me in the past but the virus blocked all attempts at antivirus installations, i tried hp restore and it told me it was corrupted. I couldnt even start the computer in safe mode, so thank god i had backed up the hard drive cause i just restarted and did hp destructive recovery and that did the trick. My question, next time how would i get around all those obstacles other than the way i did? and is there a protection program im missing? like i said i have McAfee(which i think im switching back to AVG)Malware Bytes,Spybot, and i was thinking of putting Comodo Firewall on there. Will that suffice? or is there another free program i should use. basically i want to idiot proof this computer so that they can do just about anything and wont mess it up. Thank you in advance