As far as I can find there are x64 bit drivers but they support 9500 upwards only, you may be able to find a modded .inf to include your card though my main driver supplier (Guru3D) has nothing that I can find to help you.
There is an MSI release (link here
) that you could try. If you do, you do so at your own risk
or you can wade through this Google search result
to see if it is any help