screws

So I have been a lurker on the site or a long while, and I wanted to do a project and I finally for one of the first times in my life I have the funds to make a wii electronics project, but as I was opening my wii, the the tri wing screws feel either stuck or basically stripped, so what are some...

Basically that, Im taking apart a gameboy for the first time and there are 4 infernal screws there. They are evil! Even more evil than The Four Dark Devas Of Destruction! One of them is not + anymore, its O, yep. I cant get them out. Any ideas?