Note: Windows only stores so many backups of the registry as it is quite large, so if you've continually re-booted over time 
with a Windows problem, chances are all backups will have the same problem. Otherwise, this will roll back your computer to a 
time before the problem surfaced. 

For Registry restoration in Windows XP/VISTA/7 : Simply run System Restore.


Using Scanreg to restore the Registry in Windows Me : 

From the Start menu, click Run. 
The Run dialog box appears. In the text box, type: Scanreg /restore, and then click OK. 
A Windows Registry Checker dialog box appears. Click Yes. 
The Restore Registry dialog box appears. Select a time that the Registry started correctly, usually the previous day. 
Click OK. The registry is restored. 
The computer restarts. 

(Note: If necessary, Scanreg can be run in Safe Mode) 





Using Scanreg to restore the Registry on Gateway systems with Windows Me :

From the Start menu, click Shut Down. In the Shut Down Windows dialog box, click Restart or Restart the computer, then click OK. 
As the computer shuts down and restarts, place Disc 1 of the System Restoration Kit into the CD/DVD drive. 
When the computer restarts, select option 2. Boot from CD-ROM. 
On the Startup Menu, select option 1. DOS Prompt. 
At the D:\DOS prompt, type: C:, and then press the ENTER key. 
At the C: prompt, type: C:\Windows\Command. Press ENTER. 
At C:\Windows\Command, type: Scanreg /Restore, and then press ENTER. 
Select a date before the issue occurred, and then press ENTER. 
Press ENTER again to restart the computer. The Registry is now restored.






Using Scanreg to restore the Registry in Windows 98/98SE :

restart the computer in MS-Dos Mode, and type in "scanreg/restore" at the "C:\Windows" prompt. 
The Restore Registry dialog box appears. Select a time that the Registry started correctly, usually the previous day. 
Click OK. The registry is restored. 
The computer restarts.