How to Restore Registry - Windows Backup Registry.
The registry contains extended information, settings and various other values for the the Microsoft Windows 95, Windows 98, Windows NT, Windows 2000, Windows ME and Windows XP operating system. Within the registry you can control a great majority of the operating system as well as fix a lot of issues with Windows. However we only recommend those whom are experienced with computers or whom feel confident to go into the registry.

Before going into the Registry and changing or deleting anything we ALWAYS recommend that you backup the registry.

Restoring Windows Registry:

To restore Windows registry get into a DOS prompt, if you are not able to get into Windows 98 to shutdown the computer to get into a DOS prompt as the computer boots up press and hold your left ctrl key on your keyboard which should get you into a Windows 98 startup menu, in this menu choose the option for command prompt only (safe mode command prompt only will not work).

Once at the prompt type cd\windows\command

Once in this directory type scanreg /restore this will restore a previously backed up copy of your registry. You then should be able to reboot the computer and get back into Windows.