Howdy, champ2000! Nice to meet you! There are several possibilities for this. One is your graphics card can't handle the game - have you updated its drivers?
Second, your graphics setting in Options might be too high for your computer. Try Medium, or Custom with some of the high-end stuff (water detail for example) set to medium or low. Those are the first two things I thought of. Other people may have other suggestions.
Now, you need to go on over to
Introductions and MEET all the other people! :grouphug