Make sure before modifying your system Registry about its backup, because Registry contains all information how your system runs. This backup will help you to restore Registry in case any problem occurs after modifying. Learn how you can Export and Import Registry File Before Editing?
You can backup the whole Registry and also its subkeys.
Click Start Button then type regedit in Run box and click Ok button. Here you can export the whole Registry or you can locate the required subkeys that contain the information that you want to edit.
Go to File menu option then click on Export option for backup and save it with on any your system drive with .reg extension and you can restore this backup going File menu using import option.
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