Please help, I have a virus called "infostealer.gampass"

[banksia]

I have had this Trojan for a while now i think, because it just started to slow down my computer.

I recently scanned my computer with, Norton Virus 07, HouseCall online virus scan, and i will try everything else people are going to recommend me to use.

I started noticing this when my computer all of a sudden got slow,
i thought it was some programs i downloaded, so i deleted them, still didn't help, so i recently scanned Norton Virus and i freaked out cause i couldn't get the Trojan off my computer.

Please help me get this virus off my computer :[

heres the hjt scan,

 

[FoReWoRd]

Kaspersky 7.0 or eset anti virus should do it, then download spybot search and destroy