There is a very similiar post to mine but unfortunately, no resolution was received that I could find. I have a desktop (not name brand, built by a local IT contractor) which had an infection. At the time (about a week ago) it was running XP and lost all desktop icons and Explorer showed no files or folders. I formatted and installed Windows 7 Pro this afternoon and as soon as I turned on Microsoft Security Essentials (of course, after I had reinstalled everything including all programs and drivers) it alerted me to a threat which was identified as TrojanOS/Alureon.E. I received the following error when I attempted to repair it: Error code 0x8000704ec. This program is blocked by group policy. For more information contact your system administrator. I have run TDSS Killer, MBR Check and MGtools (logs attached). The TDSS item that was found during the TDSS Killer scan did not give me the option to cure, only delete, quarantine, or skip. Any help that you can provide would be greatly appreciated!