|"I think it might be keeping track of my passwords and other personal stuff"|
You are refering to a keylogger. Those are extremely hard to remove but it can be done.
Try these in the same order
1-rkill.exe (stops the malware process)
2-tdss killer (removes the rootkit if it is found)
3-malwarebytes (run a full scan and remove all it finds.)
If these don't work for you, you may consider slaving your drive to another PC and saving all your valuable files, then do a refomat and fresh install of Windows 7. That will remove all parasites from your HD.
Some HELP in posting on Computing.net plus free progs and instructions Cheers