reboot
hit F8
tab up to safe mode, not safe mode with command prompt, not safe mode with networking, just safe mode
Go to start, run, type msconfig, go to the startup tab, disable everything you see there, click apply or ok but dont reboot yet.
Go into your add/remove and remove any suspious programs in there and after that go to the program files folders and delete the programs folder that you just deleted
Go to the c:\windows\prefetch and delete the whole folder, the folder will return in reboot
now run:
Spybot Search and Destroy and update it and run it as many times as it takes to clear your system of these items
run Adware SE Personal 6, update it, and scan your system the same way as you did SB
Run Microsofts Spyware Remover and do the same thing
Now delete your cookies and temporary internet files
Delete your history
Reboot
go back in safemode and run those programs again
Download msconfig cleanup and cleanup the entries
Download CCleaner and run it
Reboot
then run Hijack this! 1.99 and post your log