Go to control panel, system, device manager and remove the old drivers. Then re-install the new ones *after a reboot* and see if the drivers change.

Actual steps I'd take-
Create a system restore point
Go to control panel - system - device manager and remove drivers
Shut down and reboot
Install correct 64 bit drivers

I always hesitate to suggest removing drivers, but if you do it safely you should have the ability to restore.. or reinstall the original drivers


I do not work here, but the benefits are still awesome
Make your sound your own!