Hi sdlehman,
The source of this virus mainly is infected Internet sites, illegal software with off-course the "working" cracks, key-gens and patches, downloaded films, music and through P2P.
The best and most secure option left is just to format and re-install. If you should have made back-ups wirh infected exe files and other infected files on it, the chances of re-infection are real. Some say av scanners can cleanse quite some of the infected files, some advise MBAM, DrWebCureIt, combofix to scan/cleanse. It is almost impossible to recover, it is very time consuming, and if you do not go into Safe Mode immediately after infection your Windows OS might get corrupted beyond repair, because the virus is meant to corrupt indiscriminately because of the buggy infection routines. So, it is the user's choice, but i.m.h.o. the best option, total recall for your machine,
polonus