unloading my laptop - Acer Travelmate 6291

I have a laptop that has been two years with me doing all my work. It's acer Travelmate 6291. sometimes ago, i felt my laptop more longer, the machine become more hot. my friend sayed that maybe there are a lot of dust inside. cause of that, me and my father disassemble my laptop.
and, tadaa. my laptop isn't hot anymore. If you are experiencing the same thing like me, you can download the tutorial here