is not an ATI number. It may be a chipset number but still again ATI has no reference to that number. That number could also be a manufacturers number. I suspect finding a x64 driver will be impossible (if not very difficult). The only thing I can tell you is to visit the ATI website
and try some of their drivers.
Or open Device Manager and obtain the Hardware ID string listed under Properties for this device. Re-post with that info for additional help.
There is a driver listed here (but it just says for ALL WINDOWS): http://www.drvagent.com/s/sh_94v_0_e..._download.html
and here: http://www.drvagent.com/s/sh_94v_e248779_driver.html