get a copy of Webroot spysweeper, and or use TRend Housecall here :-
http://housecall.trendmicro.com/uk/.... Expect to spend a lot of time clearing them and you will need to scan over and over until the reports are trojan free repeatedly...
If you have a second computer with antivirus protection ( up to date) , unplug the hard drive, and connect it as slave to the second PC - Then run the antivirus program 'SCAN' facility, If you didn't understand that - DON'T do it , you might cause more problems than you cure.
Most antivirus programs give 14 days 'free' use , so download Trend PC-Cillin 2007 for free , install it, disconnect or disable the internet connection , and your existing AV, and run that.. often different AV progs have their strong and weak points, and what one misses the other finds easily...