Can I use a legitimate DVD Win7 product key to activate the operating system already installed?

I used a DVD Windows 7 Home Premium I bought from Amazon to install on 2 computers, THEN discovered the 2nd computer would not accept the product key.  I don't want to reinstall the OS and I can't seem to find a place online legitimately sell just a product key, so if I buy another DVD on Amazon, the product key that comes with it will allow the existing installation to activate, or do I have to spend a day or more to reload the operating system, drivers, programs, settings etc, just to stinking activation?

This information is partially incorrect. OEM System Builder licenses come with a product key.

Yes, it does not require a clean install, but because you already have Windows 7 Home Premium installed to use your retail disk, all you have to do is to change the product key, no installation required.

Tags: Windows

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