|I just had an XP PC that was in a constant loop on start-up. It wouldn't even let me do a repair install no matter how I set up the boot order.|
I had to physically remove the drive from the PC, install another Hard drive into the same PC ( I put the damaged PC in a usb enclosure) and then ran an Avast Scan on the infested Hard Drive. ( I don't slave infested drives to my PC)
Avast found the TDDS rootkit in the MBR and lots of other malware in the USB drive and removed them. I then put the the Hard drive back into the PC, did a repair install and ran multiple scans untill the Hard Drive was clean.
I finally ran combofix and the drive was clean.
Runs great now...other repair places said her only alternative was to reformat the drive...reformatting is MY last resort when all else fails.
Some HELP in posting on Computing.net plus free progs and instructions Cheers