I have a computer running Windows XP Pro which is infected with the Quick Deragmenter rogue software. I have used PCToos Internet Security, Kapersky, Vipre, and MS Security essentials to scan and not one of them has found it. Malwarebytes found a file, and said it cleaned it but it still runs when system is started. I really would like to clean it, as the user of the system does not have a back up of the stuff on it. There are several items on the internet relative to cleaning and removing, but none seem to work for me. Any help would be apprecaitated.