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It seemed like a huge process, and I wasn't eager to do any of it. So I decided to do a System Restore, essentially going back to my computer as it was two days earlier using a registry snapshot. I generally save my important stuff to the cloud anyway (thanks partly to Dropbox, which you can get at www.dropbox.com), and wasn't worried I'd lose anything.
Fifteen minutes later I was virus free. I might have lost a few bookmarks and my browser history, but it was so simple. Viruses were my big concern switching to PC from Mac, and in eighth months I've had exactly one problem that took less than 30 minutes to solve.