Is your PC acting sluggish? Are strange windows inexplicably popping up on your screen? Do you have to reboot your computer because of errors and lockups? Than try this free computer checkup and diagnostics tool that can help you detect and fix many common PC problems!  PC Pitstop

You can signup for a free account which lets you send your diagnostics to a friend or your favorite service technician so they can look at what's being reported. Or, you can post a link so the mechanics at The Pit can look at your PC to help solve tough problems.  I signed up as an anonymous user and ran the battery of tests. It took about 10 minutes to complete the tests and I've included the results below to give you an example of what its looking at. 

I ran the AutoFix feature and it corrected my problems without the need for me to edit the registry.  A nice little tool to keep your PC in tip-top shape.