|I just had to clean this very thing from a computer. The PC in my case had an Alureon infection. What worked for was Hitman Pro which you can use free for 30 days. Ignore all the ads in it that claim you need registry cleaners etc.|
You can also try the TDSS rootkit remover fro Kaspersky though I found this one crashed (as in blue screen of death) the computer I was working on--it rebooted fine.
It doesn't hurt to scan with Ad-Aware, MalwareBytes, and SpyBot S&D either. Install these and leave them on even after your infection is cleared. Update them at least weekly and run complete scans after update (also re-immunize with SpyBot after doing an update).
When you get it all cleaned up, run Windows Update (the computer I worked on would not allow Windows Update to run while infect which was a big red flag symptom to me--it would try to tell me I wasn't connected to the internet). Run Windows Update several times (it took 2 or 3 for me) until it doesn't find any updates for you to install. Also update your version of Java. I was told that Java vulnerabilities are a prime way for this type of virus to get into a system. To update Java go to Start-->Control Panel, double click on Java, and go to the update tab.