REGEDIT utility:

Most of us know what a REGEDIT is. REGEDIT or REGEDT32 is the Registry Editor Tool. I think this is the most powerful utility that can significantly damage or enhance your ability by applying a minor change. Many of the microsoft bug fixes and many other installation options are controlled by REGISTRY of the Windows Operating System among other things

How to run:

go to START->RUN and type REGEDIT. If you have typed correctly, you would see a window coming up as shown on the top side of this page.