I'd suggest updating to ATI's legacy Vista driver which works well with Windows 7, and supports the ATI Radeon Xpress 200 Series.
Go to this page: AMD Catalyst™ Display Driver
Look at "Option 1 - Full Software Suite" and select "Catalyst Software Suite" which includes the "10-2_legacy_vista32-64_dd_ccc.exe"
Catalyst Control Center and WDM driver.
Or look at "Option 2 - Individual Downloads" and select the "WDM Integrated Driver" which includes the "10-2_legacy_vista32-64_wdm.exe"
WDM driver only.