What screwdriver should I use when removing that thermal cooly thingy in a Dell Inspiron 1525?

OK, so. You know how the Dell Inspiron 1525 randomly shuts down sometimes? You know that thing that people say is filled with dust or something? That thing with the big orange cord thing? I need help taking that out. I've used a P0 Phillips, and an even smaller one, and a P1, but none of those screwdrivers work. Help?!?!?!What screwdriver should I use when removing that thermal cooly thingy in a Dell Inspiron 1525?Okay, before you really mess something up by sticking metal parts into a electronic device, I'd ask that you take the computer to someone and let them fix it for you. Or hire a monkey. Either one. :)