if you have a gaming laptop, a laptop cooler will certainly increase your laptops lifespan. If you want to clean it, just use a compress air can specifically for electronic devices.

Your laptop should be able to play crisis warhead in med settings, since the later is more optimized. Though i havent played it yet.

Regarding overheating, try google on your laptops processor. Most amd's run hotter than intel, dunno the latest ones.