Looks like the fan was running in the picture you took, or no?
If the fan still works at all, then you are probably experiencing an unseated cooler. You'll need to take it apart, pull the cooler off, clean the bottom with alcohol, carefully remove the cpu, clean it's metal lid housing with alcohol, let both parts dry, apply new thermal paste, then put everything back together
If the fan does not work at all, then we'll probably need to see a shot of the board were the name is printed on it. Removing the cooler (which you'll need to do anyway if it isn't working) will help since you should be able to get a shot of the processor if you don't already know which one it is
If it works for a short period before overheating, go to Control Panel -> System and then post up the CPU type and RAM specs. That along with the brand will typically identify everything