Right click the desktop
Create a new notepad file
Copy the entries and paste into that file
Save as *.reg
Double click to import
You will get a pop up that says importing can be dangerous (etc) click OK
Done
I doubt that will fix your backup issue and you should not edit the registry unless you absolutely know what you are doing as it can make the computer unbootible. The above change is usually safe but as usual if you value your data you should backup &/or make a restore point