This puts you in a tricky spot. . .
The disk you get will install Windows 7 on your machine.
If you study the licensing terms, you'll see that to meet your obligation, you must install your Windows using the builder kit.
You'll also see that the license says you can install this windows only on a machine you'll sell to someone else -- for your own use is not allowed. (The theory is that you're now a system builder, not an end user.)
It's profoundly difficult to follow the letter of your User Agreement with Microsoft. It's also incredibly easy (and tempting) to ignore.
Cheers, PW.
P.S. Whatever you do, don't enter the Product Key during the installation. Do it later, after you're sure your Windows is installed and running the way you want. You have 30 days to activate -- use them wisely.
P.P.S. I'm not advocating for or against Microsoft. They wrote a torturous User Agreement. Reasonable people disregard it.