Windows activation problem

[Wiking007]

Hello. There was such a problem, the motherboard in the computer broke down, the repair was not cost-effective and another board was bought, Windows 7 was installed, it worked fine for a while, but then suddenly a message appeared that the system was not activated. When you try to activate with a key, it gives an error 0xC004F063. When checking the bios, there is no Windows key, the seller of the board said that the BIOS was flashed using a programmer. It turns out that the key is missing in the bios. How do I activate Windows now?

[WAWood]

@Wiking007 

The simple answer is -- you can't!  Why? Because the Windows version you are running is an HP OEM version and that requires a key from HP, which came with the original motherboard.  When you changed motherboards, you threw away that key and HP is not going to provide you a second one, nor does it sell windows keys.

So basically, you would have to buy your own Windows version, complete with key, install and activate that.