(new lenovo laptop) win7 - my sound sputter for everything i do

everything i do, headphones or no headphones my sound sputters. it doesn't sputter all the time. it will play normal then randomly will sputter for a second then go back to normal. i cant find anything of what it can be or do.


lenovo win7
intel core i5-2450m cpu @ 2.50GHz
4gb RAM
64-bit

sound drivers:
CHDRT64.sys
8.54.0004.0000(english)

device:
speakers(conexant smartaudio HD)