if you still cant get it out then try finding a small screwdriver which will sit in the (now stripped head of the screw). put a tiny amount of superglue on the end and put it in the head. leave it for a few minutes for the glue to set and then turn. it should come out.
hope that helps
rich (king of bodge)
King of Bodge is the right title - this being the same dude who's freak back got stuck on his cocker, so he loctited a teammates freak front to the back.