I am attempting to install the video driver for an Asus EB1036 that was downgraded from Windows 8 64-bit to Windows 7 64-bit.

All other drivers installed successfully but the video driver installer (which looks like it should work as the hardware matches the name in the PCI database) gives the following error:

The CPU is 64-bit and the driver (from here) is also 64-bit.
Does anyone have any ideas what could be going on here?