From the article: Coding Horror: How to Clean Up a Windows Spyware Infestation

Let my mistake be a lesson to everyone reading this: never browse the web without the very latest version of your preferred web browser. Intentionally choosing to browse the web with a three year old browser, as I did, is an incredibly dangerous thing to do.

Even though this article gives a good walk through of how to clean up a spyware infection, always remember that once your box is infected its impossible to tell when it is truly clean. Your best bet is to reinstall.