*moved to Techincal Support*
There you get (maybe) a better help.
We have to know your computer facts. What Graphic Card you are using, speed of comp,...
How to update your Graphic Card:
1) Go to the mainpage of the producer.
2) Search the newest driver for your graphic card and download it.
3) Uninstall your currently driver you´re using. (Go to: My Computer -> Control Panel -> Software and then search your driver and uninstall it. Don´t forget to restart your computer)
4) Install the newest driver and restart your computer again.