As suggested by vaccy already, but I really want to emphesize again on rebooting in
safe mode.
It is of no use (not much) that you do virus scans, repairs etc, unless:
1) you have turned of System Restore
2) you have booted up in Safe Mode with an absolute minimal config.
A lot of trojans these days can easly trick various virus scanners (including the very well know and established virus scanners).
I shouldn't suggest this but if you must download cracked stuff, then run the programs in a Virtual Machine or at least with Sandboxie....and always turn off your network connection before running them...
/ 
