Check the fuse that is specifically for the spoiler. It is under the hood in the fuse box that is in front of the Driver side (American Side). I think it is fuse number 20 in the manuel. I know that when it is pulled, the spoiler light blinks and it is stuck in whatever position it was left in. It might be blown and you need to replace it.

However, I'm not sure if it affects the windows, so it could be something else. But its worth a try.