Hi, I am Dave, I will help you with this.
Check the manual for that keyboard usually there is a method indicated to reset the keyboard.
Also, on the keyboard, check for a key to switch between Windows and apply, some of those keyboards have a key like that.
Otherwise, the solution may depend on your keyboard, try each of the following keyboard shortcuts one at a time to see if that gets the Windows key working.
Fn + Windows Key
Fn + A
Fn + S
Fn + Spacebar for 3 seconds
Tap the Windows key twice