If you made the changes with RegistryFixer or RegistryCleaner, you can use the Undo-It tool (under "System Protection") to reverse the changes. If you used RegistryMagic and you're using Windows 98, the following steps will restore your registry to the state it was in when you last successfully started your computer.

1. On the Windows Start menu, click Shut Down. 
2. Select Restart in MS-DOS mode, and then click Yes. 
3. When your computer has restarted, at the MS-DOS prompt, type the following: scanreg /restore 
4. Restart your computer.