Replace my laptop fan with new one.

After two years hard work, my laptop's fan broke down. Temperature of my laptop was 58 degree. ha~. So I replaced the old fan with new one by myself. In order to do that, I had to disassemble my machine. Unfortunately, one of the screwhead was worn down.. Even though I had been tried hardly to unscrew it, I couldn't.. And, as you know, the final solution of such case is just strong 'force'. Poor my laptop.. I'm sorry T_T...