You could try to glue a small piece of metal bent in an L-shape (maybe small allen wrench) to the head. wait till dry and try to turn the screw. Some of the screws are small!
Good luck.
It may be what is called a torx screw, if so perhaps a visit to your local hardware store is the next step. probabaly a # 6 or 8. I got a decent set of various small drivers with a extension handle at RS.