If you don't mind your computer being a little ginea piggish for a couple days, you can learn quite a bit about Windows, and also how to do virus removal with software like HijackThis. It's an extremely powerful tool, which is mostly what I use for virus removal. Especially if I get infected with something more serious than pop-ups, I'd use HijackThis to disable to virus files, then reboot the machiine and clean off all the ancellary junk with automated tools like Malwarebytes and spybot.
Another recommendation (and it is kind of overkill). Best Buy had some really effective tools. So go online, and download MRI (latest version you can find of SoldierX). comes with a stand alone OS and automated virus removal software. It runs 5-8 virus removal tools (updates to latest definitions as well), and requires no human interaction (unless you tell it to). It was specifically designed to be simple enough for a monkey to use (Best Buy's Geeksquad guys don't relly have to be that bright) and be completely automated (for overnight repairs, and repairing several machines at once). It's more inefficient than removing viruses by hand (obviously), but if you just wanna pop in a disc and leave it on over night, it can't be beat. I've only run across a few viruses that can survive that much of an attack, and I've done thousands of virus removals in my time (I used to work for BBY, and was the main virus guy).
That MRI disc is really freaking awesome and handy. It's designed to be an "I can fix anything" disc, and its constantly updated and maintained by some really smart guys. I'm not one to praise Best Buy, especially with how shittily that company treats their lower end employees, but they really did make an awesome set of tools for their employees. It is piratable, and Soldier-X is the cracked version of those tools.