Try this, install the older 10.11 drivers from the disc provided.
After you do this, download the updated drivers (13.1, or 13.3 beta drivers) and then just run them- dont delete the older drivers- just run the new downloaded ones and they will do all the necessary overrides and such.
Let me know if this works.
It worked. thanks. I tried it before and it didn't so I don't know why it did this time. Thanks though