From the Register Editor dialog box displayed, click the File menu, follow by Export
From the Export Registry File dialog box displayed, you can choose the location to export the registry entries. There are 2 important points to note here:
1) Make sure the file type is set to Registration Files (*.reg). You do not want to want to save as txt as you will not be able to import the registry file in the event that your windows registry is corrupted.
2) Under the Export range section, click on the radio button 'All' as you want to backup the entire registry file, not just part of it.
Once finish, click the Save button to start backing up the registry. Just wait for few moments and the entire process will be complete.
The steps to backup Windows registry here can either apply to Windows XP or Windows 2000. If you already backup the registry, and can always restore back the registry in case there is any problems. For more details steps, read the article on restore windows registry.
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