Work your way through the list:
Try Hitman Pro Trial Version: http://www.surfright.nl/en/hitmanpro This program may be run from a flash drive.
And/or
Try TDSS Killer: http://www.bleepingcomputer.com/virus-removal/remove-tdss-tdl3-alureon-rootkit-using-tdsskiller TDSS Killer may be run from a flash drive.
You may wish to download (on an uninfected PC) one or more of the following rescue scanners to create bootable media to scan the infected PC (list courtesy of forum member, GreginMich):
http://windows.microsoft.com/en-US/windows/what-is-windows-defender-offline
http://support.kaspersky.com/viruses/rescuedisk?level=2
http://www.f-secure.com/en\_EMEA-Labs/security-threats/tools/rescue-cd/
http://www.bitdefender.com/support/How-to-create-a-BitDefender-Rescue-CD-627.html
http://www.avira.com/en/support-download-avira-antivir-rescue-system
http://www.avg.com/us-en/avg-rescue-cd-download
http://www.freedrweb.com/livecd/
http://www.superantispyware.com/portablescanner.html
http://support.kaspersky.com/faq/?qid=208283363
Each rescue scanner will miss things – because none of them will have a perfectly complete and up-to-date set of definitions; so you might need to use several of these rescue scanners, or something like the Shardana Antivirus Rescue Disk Utility, which creates
a custom bootable CD or flash drive that includes multiple rescue scanners:
http://www.sarducd.it/
-steve