today my heart missed a beat when i saw my cpu (i5 3570k ) temp go 75 C while playing calll of duty 4 for about 40 minutes !!!! i m thinking of installing coolermaster hyper evo 212 after 1 to 2 months .......bt still isn't the temp too high ?????? (though i m using the stock cooler)
More about3570k temperature issue
The stock cooler is not very good but if you are running at stock clocks it should work fine so maybe it is not installed very well.
Those temps are perfect for your CPU. If you are still worried about it, but a decent aftermarket cooler or upgrade your case fans.