My guess is that you are infected.
FWIW: I believe that attempting to run various malware-defense programs...after the fact...is bound to be ineffective for some types of malware where discovery is attempted. Shutting the door after the house has been invaded...doesn't seem to phase some of the persons who develop and employ malware each day.
I suggest reviewing the procedures at BleepingComputer.com - Am I infected What do I do - http://www.bleepingcomputer.com/forums/f/103/am-i-infected-what-do-i-do/
and making a post there. If nothing else, it will eliminate that possibility and you can then focus on potential hardware, software, O/S issues that may be at work.