The instructrions seen for Artic Silver 5 if that is the Artic Silver paste you used would be to run the system for so many hours on the first day or night and shut it for several to allow the silver particles and base to start bonding and seeing some heat transfer while cooling. Then you take things easy for the next few days.
If too much paste was applied or not enough either way the cpu is apparently running hot after any good period of time and ut oh! You may want to look over the instructions provided by the company to compare to how you put the paste on there seen at http://www.arcticsilver.com/instructions.htm
First choose whether it was AS 5 or one of the others. Then you have to select Intel or AMD from the new window followed by the cpu type. Something wasn't done right like not seeing the sink placed down on correctly to be running hot like that. Go back over everything.