I'm exactly the same usually, but this time the official one was the baddie. Anyways, as long as you got it working it's all good.
My game is unplayable with severe framedrops every other second. I Think it´s a Windows 10 problem to be fair. Because I have recently built a new copmuter with a 970GTX gfx card and I also have invested in an G-synk monitor. I still have the same problem as with my last computer. Problem started when i swiched to Windows 10.
Which screen mode (full or windowed) are you running and have you tried the one you're not currently using?