New
#20
The Windows 7 product code on the OEM COA sticker, to prove you have a valid windows 7 license and qualify for the free upgrade to 10. Even though Windows 7 OEM activated PC's from the same manufacturer share a common product code, they also have a COA sticker with a unique code on it. Entering that code when prompted would prove you have an official OEM install. The Windows 7 OEM factory install key is useless by the way. If you do a normal install with regular install media that key will not activate, even by phone. It's deliberately blocked rom activating online. The only way it works is if you use the custom OEM install media from that manufacturer. If you do that, you don't need to know what the key is as its entered automatically. Windows 8 though, is a totally different scenario. Even then though, you don't really need to know what the key is. If you use the correct install media for your version of Windows 8, its read automatically during the install.