Compag Presario 2100 overheating issue

I have been working on a laptop for a friend and am now having some issues with it. I managed to get windows xp reinstalled, but then found the system restore disks and decided to use them instead. Now I am stuck with an issue that is rather weird. I go to install either the restore cd’s or windows xp, then the laptop will shutdown at some random point. I have blown out the fan, ram, and processor slots, but it still feels hot to the touch in those areas. I have not taken apart the case yet as I cannot find a guide on how to take it apart. Any help on this is welcome.