I use Spyware Blaster and Secunia all the time. I will do the other steps.
LATER:
DONE: 1. Disable System Restore and reenable it after step 3.
DONE USING CCLEANER: 2. Clean your temporary files.
===Now running DrWeb CureIT =======
As for 3, next step, I did that earlier (did not discuss it here then). It started the text only screen was showing the scan in progress. I left the machine with boot scan running, but when I returned much later, machine was on, screen was black, everything unresponsive to mouse, touchpad, any key. I had to hard kill power (hold button). Coming back up I had the failure to start situation and had to run the 'do you want to try to repair start up.' I don't like severe failures like that.
3. Schedule a boot time scanning with avast with archive scanning turned on. If avast does not detect it, you can try DrWeb CureIT! instead.
4. Use SUPERantispyware, MBAM or Spyware Terminator to scan for spywares and trojans. If any infection is detected, better and safer is send the file to Quarantine than to simple delete than.
5. Test your machine with anti-rootkit applications. I suggest avast! antirootkit or Trend Micro RootkitBuster.
6. Make a HijackThis log to post here or, better, submit the RunScanner log to to on-line analysis.
7. Immunize your system with SpywareBlaster or Windows Advanced Care.
8. Check if you have insecure applications with Secunia Software Inspector. (DONE REGULARLY, WILL REPEAT)