Under Windows XP SP2 I was able to use the DH mobility update (
http://www.driverheaven.net/patje/) with the latest ATI drivers with my laptop which also has an IGP 320M.
With Windows 2000 Pro SP4 I was unable to use the DH mobility mod. Tossing the problem into Google I found that ATI stopped supporting the IGP 320M in Catalyst 4.4.
I would start with the ATI drivers that are supported (
http://www.station-drivers.com/page/...20mobility.htm ). The Catalyst 4.4 drivers with links to DL are on the bottom of the page.
I recently upgraded (downgraded?) to 2kpro from XP due to DVD / AVI crashes with Omega's drivers with my IGP 320M. (Now if I can find Conexant audio drivers I'll be good to go..)
Hope this sheds some light on the subject.