Yeah, manual registry editing can get tricky if you're not familiar with how it works. I'm hesitant to recommend that, especially if you're hesitant to do it to begin with.
You might try an uninstaller app if you're still feeling frisky. I'd suggest one called IObit. It's free, and I've had good luck with it in the past.
http://download.cnet.com/IObit-Unins...-75161625.html
(Click the download that says "Download Now", directly under the IOBit Uninstaller name.
Ignore the green links that say "Free Download".)
There's a video there showing you how it works. It's pretty straightforward. See if that will uninstall it for you.
If that fails........ You need a fresh upgrade my friend. Bring that bad momma jamma to KC for a day and give me a heads up, and I'll get that sucker squared away once and for all. Will work for beer.....