Help with a psp!!!!!!

Ok so i got this screw in the battery place right beside the switch button on/off. The thing is that, when i tried to get it out the screwdriver broke and a piece of screwdriver is stuck in the screw head. I really have to get that screw off is there anyway to do it? My psp screen is so dirty i can't see nothing that's why i want to open it. Anyone know hoe to get it off?

Regards,
ale632007