I have bought my used laptop, from a school. Just been used a student for 2-3 years. On the Windows logo sticker on the underside of the laptop is says "Win7 Home Prem OA" and when i check with Ccleaner it says "Windows7 Enterprise 64 bit
sp1" and windows own (toolbox/system) says "Windows 7 Enterprise"
The problem is now when i tested to do a Windows 10 upgrade. It started to run the upgrade and i entered the productkey, that is on the windows sticker on the underside, then it said "Product key not valid"
I have also tested with program to read the productkey that is in the registry and it's just BBBBB-BBBBB-BBBBB.....
What to do??