[raverbashing]

Sure, where's the clean media and the license for that?

You usually can't install (non-OEM) Windows with the serial present on the sticker attached to the computer

[superuser2]

http://www.howtogeek.com/186775/how-to-download-windows-7-8-...

Use the serial from the COA. Initial activation will fail, but when you perform telephone activation it succeeds.