It sounds like you are having graphics problems. Let me explain, if a game requires resources that your graphics processor has then it will run slow. Sometimes a game wont run at all. This is what it sounds like. To troubleshoot this go in game and change the video settings. Set them as low as you can and see if the game smooths out. You may also try making sure that you video drivers are up to date. Outdated drivers can effect over all video performance. If worse comes to worse, do some research and find a video card that will best suit your budget and performance needs.