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Mar 24, 2020 · Windows 7 activation is one of the significant problems amount its users. Most people don’t have an original license from this system and have an on-screen message reminding you to activate your Windows. A Windows product key, in simple definition, is a 25-character code that is used to activate Windows. It looks like this:. May 09, 2018 · I've used this same Windows Installation DVD to re-install Windows on 4 computers, and have used the product key stamped on the side of 3 of these computers to activate successfully. Each of those 3 computers now has a different Product ID, all beginning with 00371-OEM. Windows 7 Product Keys 100% Working Serial Keys | Full Version. The Windows 7 product key is a sequence of 25 letters and numbers divided into 5 groups of 5 characters each (ex: xxxxx-xxxxx-xxxxx-xxxxx-xxxxx) that is used to activate either the 32-bit or 64-bit Windows 7 edition that you installed.