I don't know if you have it...but after you have downloaded the font, extracted it...try clicking it ONCE. As you click it...does the module on the left expand? Can you find something on the left along the lines of "Move this file" and if you do, click that.
When the window pops up, find your Local Disk (C drive), WINDOWS, Fonts and click move. It's when they show that you're installing it and it'll be done in a few seconds.
To me, this is more efficient. If you don't have that, then all the other ways will work.