sorry, but I’m afraid it is not related to BON-13898, which was a general issue for every system, no matter the video card driver (nVidia, ATI or Intel) or system setup.
I would try to uninstall the driver and install it again, you can try with this version:
I’d recommend to only install the driver, without the Catalyst software (you’ll need to select the custom install and deselect the unneeded components).
Unfortunately, I doubt anyone tested 8.5 with anything older than HD 6xxx cards.
Please, also check Control Panel -> Mouse -> Pointers. Is it using Aero (system scheme)?