Backup the windows registry

To backup the registry and also to Restore the registry I specify the link below to KB from Microsoft. This article describes how to back up the registry in Windows XP or Windows Vista.

http://support.microsoft.com/kb/322756/

Windows registry information for advanced users
This article describes the registry. This article also includes information about how to back up the registry, how to edit the registry, and lists references for more information. (For Advance User)

http://support.microsoft.com/kb/256986/