Hi I have the same videocard and Win 7 (runs okay) and was looking for a more recent driver. I recently moved house, but I have the disc boxed somehwere..
I had a closer look at the AMD site and I think you need to look at graphics / legacy / ATI Radeon X series / X1xxx series (submit)
then there are 2 downloads Catalyst an WDM
The Catalyst Control Center is to update and fine tune you video card?
The WDM is for video output when Windows says it's missing a few drivers?
mind the useful info on the AMD site about uninstalling the previous version before installing the next
It's a bit late in the evening for me now to test them
If you have already solved you issue, feel free to enlighten us, or if not, feel free to ask again