Cleanup and optimize your PC with this tool, which has has plenty more features thrown in. You'll find a startup organizer that shows you what programs start automatically when you turn on your PC, and lets you disable them.
There's also a Registry cleaner, defragmentation tools, anti-spyware features, and much more, 28 tools in all. This program is shareware, and there's only one drawback to it--at $60 for registration, it's not cheap. Still, it's worth trying out for free, and after 30 days, you may decide that it's worth the price for registering.