I bought this license and activated this Windows like 1 or 2 years ago, and it's a valid key, I had my Windows Activated and everything works perfectly until today when I saw a watermark at to bottom corner asking me to Activate Windows.
I tried to reenter my product key but it says that I do not have a valid product key and refuse to activate my windows
Is there any solution for this?
P.S. I didn't reinstall my Windows or make any hardware change