Can you try right clicking and run as administrator? That’s super weird I have no idea whats happening (you might also try googling for “unity game not opening on windows” or something similar.....maybe other people have run into this.....
OMG YES! Nevermind I sussed it! I basically right clicked on the game, went into properties and ticked the "unblock" box! can't believe it was that easy..sorry to keep annoying you with all this, thanks again! and now I can finally play!!!