In the search box (or the Run textbox in Windows XP) type regedit and press ENTER.
If you're running Windows 7 or Windows Vista, you have the option of clicking the regedit listing from the search results at the top of the window (as shown in the Windows 7 example in the screenshot above).
The regedit command will open the Registry Editor program, used to make changes to the Windows Registry.
Note: If you're using Windows 7 or Windows Vista, you may need to answer Yes to any User Account Control questions before Registry Editor will open.
Important: Changes to the Windows Registry are made as part of this tutorial. To avoid causing major system problems, be sure you're only making the changes outlined in this walkthrough. If you're not comfortable making changes to the registry or you're worried about making a mistake, I recommend that you back up the registry keys we work with. I'll link to instructions on doing that when we reach those steps.