I installed Windows 10 Pro 64 bit on my machine. I have an HD 7990. I'm using driver version 15.7.1.
I can't do anything with 3D. All games lock up after the 2D splash screens and logos. This is true for *any* 3D game. Additionally, I use the University of Stanford's Folding At Home program. Prior to the update, this card would earn about 300,000 points per day. After the upgrade I get less than 80,000 ppd. This is about as good of an example of the problem as I can think of.
I downgraded my drivers to 14.4 and my folding points got up to about 200,000 ppd which is a great improvement. I am able to play Total War: Shogun 2 although after a time, the game locks up tight and I have to shut it down.
Intel Core I7-920
24 GB DDR3 1333
Samsung 840 SSD x2 in RAID 0