Cars have windows. Houses have windows. So it can't be windows that makes the car go.

I swear I don't understand, and he tried to explain it to me. He said it's a double meaning with Windows the operating system but I just don't don't don't get it.

Can anyone make this understandable to me? I may have screwed up the retelling, because honestly I have no idea what the hell's going on with this joke.