Where did you obtain your game?
Is is the Retail(CD) version OR a Downloaded version?
If Downloaded, from where?
If Retail, Is this the Original CD being used OR A No-CD crack OR A Copy of the CD?
Also, what are your system specs:
Latest SP for OS-ie. SP3 for XP, SP2 for Vista, or SP1 for 7?
Please answer ALL the above questions, so we can better help you....