Oops! You made a big mistake!

Before I go into the steps I take to resolve simple problems, I'd like to tell you this: If you do something that scares you and you think you've really messed everything up, don't worry! With a Windows OS you can restore your computer to a previous date. This will undo your mistake without losing any documents you may have created since that date. This is done by going to START/All Programs/Accessories/System Tools/System Restore. Click next and choose a date when the computer was running ok. Reboot.