mrrwkn - First let's determine if the hard drive will need wiped.
Download the programs that I list, the list will match the download links, I am a Computer Technician, so let's get started.
WHEN YOU DOWNLOAD, RUN ONLY ONE AT A TIME,,,, NOT BOTH..
1. Spybot Search and Destroy - download, install, run the updates program that's built in so your files are updated, Scan the hard drive, and follow the prompts.
2. Adaware SE - Next Download this one, and do the same.
3. After these are Downloaded, updated, and Scanned, email me after awhile with the results: Better, Same, Worse.... Come Back to Yahoo Answers, Click on My Name, Click Contact, this will send me an email, I will respond within 24 Hours.. Free Service for you, and the downloads Are Also Free, and Virus Free.
Then if we need to, we can Format the hard drive and reinstall the OS, but only as a last resort. Good Luck