Windows Registry Editor - REGEDIT.EXE

REGEDIT.EXE is the Windows Registry Editor. It is available in nearly all versions of Windows. This tool can be used to backup, restore, or edit any of the Windows Registry keys. Your registry controls how your computer functions. If some registry information is missing or damaged, your system could fail to boot or operate normally. For this reason, we'd strongly recommend making a backup of your registry before you attempt to make changes. This can be done by running Regedit, selecting "File" then "Export".

How to backup, edit, and restore the registry in Windows XP: http://support.microsoft.com/default.aspx?scid=kb;en-us;322756.
How to backup, edit, and restore the registry in Windows 2000: http://support.microsoft.com/default.aspx?scid=kb;en-us;322755
How to backup, edit, and restore the registry in Windows NT: http://support.microsoft.com/default.aspx?scid=kb;en-us;323170
How to backup, edit, and restore the registry in Windows 95/98/Me: http://support.microsoft.com/default.aspx?scid=kb;en-us;322754.

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