I can't find the make and model of your machine but my desktop did that too. And I know what I was doing!
However I learned that the Intel RAID MATRIX STORAGE MANAGER (sorry but the name changes over time so I leave it to you to find the right name) was non-optional or I would get stuttering on playback.
Windows 7 Ultimate; clean install, 4gig DDR2 (3.12 usable)
1 gig dedicated video RAM
Since Win 7 install I have audio problems that sound like stuttering during playback of music and video on PC from any source. I d/l all codecs; updates, etc. No help. Did a search and can't find solution. Could it be that I d/l Internet Explorer 9 Beta??
Thanks for any help.