just updated to 7.0.1 and having audio problems

im using a macbook pro with 4gb and a 2.8 ghz i7 processor…just updated to the 7.0.1 version
and since than im having problems with the sound its like a CPU overload problem when the sound comes out with noises but the cpu metter is low so its not posible…anyone have the same prob and know how to fix it??