1. Download HiJackThis tool and scan/analyze your system environment

2. Locate a suspicious DLL file

3. Go to Start -> Run… and type:
regsvr32 /u <path_to_suspicious_DLL_file>

4. Run HiJackThis, press Scan and find that suspicious object, then press Fix

5. Now try to rename that DLL file, use Unlocker tool if you can’t do this manually:

6. Download and perform system scan with SuperAntiSpyware: and F-Secure BlackLight:, see if anything was detected.