|Run these free programs:|
Ccleaner slim (no toolbar)
Then download avast free, install it and allow it to do a bootscan on reboot, move all it finds to the chest.
You say HJT can't remove the trojans, are they by chance in system restore? If so, turn off system restore and rescan. The above should work for you.
All the free progrs are listed on one page when you click on my link
Some HELP in posting on Computing.net plus free progs and instructions Cheers