If we're going this deep into things, let's talk about how to REALLY speed your computer up.
Search out and download EasyCleaner. It's an old tool, but it doesn't need to be up-to-date to do its job. Install it and open it up. The top-left button should be labeled "Registry." Click it, then click "Find." It'll scan through your registry and find entries that are useless or not connected to anything any more. When it's done, make sure they all have green lights and nuke them.
Close the registry scanner and open "Startup." This will list everything that is set to start with your computer after you log in. Go through it an kill everything that isn't NEEDED. Leave driver companions, OS systems, and antivirus programs, obviously. The most common targets are programs that sit in the backgroud just checking for an update, like Java, Acrobat Reader, Quicktime, iTunes/Zune, ect. I believe you can even use this to disable Windows Messenger if you don't use it.
After all that, restart your machine and it ought to be a clean dream.
