graphics driver resolution issue

Fri Aug 25 03:27:13 UTC 2006

when i run ubuntu,my res is stuck in 640x400 and will not change,but on WinXP i can change my res from 640x400x16 up to 1024x768x32 at 75 Hz,ive tried downloading the driver from my manufacturuer site(i have an ATI Radeon Xpress 200 Series chip),but gedit cannot open the archive and stuffit(run as .exe through wine)cannot open it either,and the windows .exe installer doesnt really help because wine either cant or wont open the graphics display panel.Any ideas how i can fix this or where i might find an answer if no one knows?
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