Photoshop is disabled

I have Photoshop version CS3 on my Windows 10 computer.  I bought this version a number of years ago, and have been using it for years.  I now get a pop up message that says, "Your unlicensed Photoshop has been disabled." 

I PAID for this version years ago, so why did Adobe disable my version?  It's not an unlicensed version, I bought it from the Adobe website.  I uninstalled CS3, but I still get the pop up, plus, when I re-install it, my version is still disabled.  How do I get this error pop-up to stop popping up, and get my version CS3 to work again?

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