Problem installing driver manually in Windows 7.

I'm trying to install the 32bit Windows 7 driver manually for a Radeon X1950 though the instructions on this page: http://bumptop.com/support/drivers.php/

When I select "Have Disk", then browse to my extracted folder and select .inf file, it says: "The files you specifed doesn't contain a software driver compatable for your device. If the folder contains a driver, make sure it is designed to work with Windows 32 bit operating systems." And yes, I'm using the 32bit file, I checked. Any ideas?

Thanks.