Loafy ,
I also have the same G75 with the 660m, I used to get all my drivers for my gpu from asus (early last year) but
I just went right to NVidia GeForce and downloaded their updater and use the updater through them for all the updates.
You might want to try that....
Just delete your current drives and do a fresh install with their updater.
G751JY-DH71|| G75VW || Intel Core i7-4710HQ (2.5GHz || NVIDIA GeForce GTX 980M 4GB || |NVIDIA GeForce GTX 670M 3GB || 1 TB 7200 rpm Hard Drive, 256 GB Solid-State Drive (PCIEG2) || Intel Core i7-4710HQ (2.5GHz