ok well 60C for a CPu is really hot for idling
you might want to see if its securely attached if its not see if the clips aren't bent or anything like that.
the problem is looking like your cpu is overheating and the safety measure is kicking in. anythingg thats cpu intensive can kick up your temps aapps, installs, games.
re applying the thermal paste might do it. all it takes is slim layer and you spread it over using a card or some paper or material like that.
here are some instructions for re applying thermal paste
http://www.arcticsilver.com/arctic_s...structions.htm
and the thermal paste here is good
http://www.newegg.com/Product/Produc...82E16835100008
can you post your systems temps with everest
http://majorgeeks.com/download4181.html
just screenshots ya know