Welcome.
When asking for help, it's best for everyone if you also list your specfic hardware. Most importantly, your video card, monitor, CPU and operating system.
There are many reason why you are having trouble but it's hard to help without knowing more about your computer.
I suggest you take the 5 minutes and add you computer specs in your 'signature' which apppears below every post you make, as you can see just below this reply.
The first suggestion to uour problem is to update you video drivers. Many people don't think to do it often but it help greatly with a very wide variety of problems. Also, be sure you have the latest patch(es) for any game you';re having trouble with.
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