Before editing the system registry will-be-modified sections should be exported or the registry should be backed up. It will restore the system registry to its initial state if needed.
How to export registry sections
In order to export a registry section to a file, perform the following actions:
In the left hand corner of the screen click on the Start button.
In the Search line type regedit and press Enter.
Enter the aministrator password if it is asked for.
Confirm start of Registry Editor it is asked for. To do this, click on the Yes button in the User Account Control window.
In the left hand part of the Registry Editor window right-click on the required registry branch to be exported.
Select Export from the open context menu.
In the Export registry file window enter the file name and select the folder to save the file in.