Sound deterioration

[steadfast1984]

everything runs fine, then after a few weeks, from a clean install of win7 64, my audio starts to deteriorate. it sounds like the matrix distortion. I do a system restart and everything is fine, then it happens again. I tried a full Clean install and driver reload and everything went in without a hitch. could it be a driver bug?
My system specs are in my profile.
Im using the on-board sound card that came with my mobo.

 

[steadfast1984]

everything runs fine, then after a few weeks, from a clean install of win7 64, my audio starts to deteriorate. it sounds like the matrix distortion. I do a system restart and everything is fine, then it happens again. I tried a full Clean install and driver reload and everything went in without a hitch. could it be a driver bug?
My system specs are in my profile.
Im using the on-board sound card that came with my mobo.

VIA HD Audio drivers and Deck

 

[steadfast1984]

second question, would it be wise to go to a stand alone sound card? if so what are some good makes?