|I don't see there where they tell you how to install a .reg file without using a registry editor, which again is going to be an exe file.|
So, just download the .reg file from the link there and save it where you can find it. Then right click on it. The box that opens will have a Merge option. Click on that to install the fix.
If you're downloading from another computer, copy it to a flash drive or a removable media that both computers can use and then transfer it to the ailing computer.