I have got Windows Vista Business with SP1. I am getting skipping sound when listening to music in both iTunes and Winamp. it unually happens when I am opening a program or something, but the computer is dual 2.5Ghz with 4gb Ram. The music is on an external HDD

As far as I know I have got all the latest drivers. I have got a Dell XPS M1330, i reformated when I got it, but beleive I reinstalled all the correct drivers.
Also listening to it on Logitech 2.1 speakers (Z2300)

Sound in intergrated SigmaTel High Definition Audio (Codec:

Any help would be great as it is very annoying lol