Sometimes ATI Graphic Cards have problems to fit with different games , install PhysX http://www.chip.de/downloads/Nvidia-PhysX-System-Software_44523543.html it supports NVIDIA drivers on ATI Cards.
Useful for any kind of game which doesn't compare with ATI. I have ATI Radeon HD 7870.
after installing this, what next?
1. Open Windows Features.
2. Expand the Hyper-V sub-section, and do step 3 or 4 below for what you want to do.
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3. To Enable Hyper-V
A) Ensure that all Hyper-V options are checked as shown above, click/tap on OK, and go to step 5 below.
4. To Disable Hyper-V
A) Uncheck Hyper-V, click/tap on OK, and go to step 5 below.
5. Restart the computer when prompted.
i've tried all the suggestions, it works a lil bit but still it is a little laggy. i downloaded anti lag. still the game won't run smooth