Invalid Product Key when upgrading to Win 8.1

I just upgraded from Windows 8 (which came pre-installed on my Twist) to Windows 8.1. This is supposed to be a free upgrade and all reviews recommend people do the upgrade.
However, my product key now is showing up as "blocked" and I can't activate Windows. I called Microsoft and all they can tell is that the key is invalid. I called Lenovo and all they can tell is that the keys they have only work on Windows 8.0, they don't have Windows 8.1 keys.
So, now I need to roll back to Windows 8.0, but the only way to do it is to do a clean re-install. Obviously, a huge problem, and I'll loose all my progams and settings.
Lenovo should let all their customers know that they SHOULD NOT upgrade to Windows 8.1 right now. And they need to find a solution to this ASAP.
I have 30 days when Windows will continue working, but after that it will lock up.
Solved!
Go to Solution.

No, I did not make any changes to either hardware or installed software. The upgrade process was the usual "go to MS website, click Update, wait for download to finish and start the update".
I did contact both MS tech support and Lenovo tech support. Neither could help. Lenovo tech support (I talked to them twice) was the one who told me that Win 8 product keys they have will not work with Win 8.1. They told me that I would need to reinstall Win8 from scratch and sent me the recovery disc set.
I was actually able to resolve this now. What I think happened is that Win8 key was coded somewhere in the laptop's bios and the new version of Windows was reading it incorrectly. There is a program that lets you extract OEM Windows product keys: : http://forums.mydigitallife.info/threads/29789-RW-Everything-Latest-News The program gives you the correct key. Once I entered that, I was able to activate Windows.

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