Had the same problem on my asus laptop. Looked up a video guide, bought some good thermal paste, and popped it open and repasted the Cpu. Dropped 30 degrees on average easy. Cheap Asus thermal paste junk.
Even though I built a PC myself I don't really wanna mess around with it because I might mess something up
stuperstrong - It still goes to 90c on a airflow area like on my desk. Is there a decent cooler pad? (Cheap) which you would reccomend ?