Trend Micro System Cleaner is tool that scans computers and cleans sypbots, viruses and trojans. It's free and is one of the best methods to clean an infected system if your currently installed antivirus is infected.
1. First download the tool.
2. USe the lpt(Pattern) file for Windows.
3. Remember to run the sysclean.com utility in the safe mode.
4. After cleaning check the log file. Reboot to normal mode and reinstall your regular antivirus with updates.