There is definately some kind of conflict going on. Try closing some programs running the background using Task Manager. Go to www.processlibrary.com
and type in each process and see if its required for Windows to run. If it is not necessary, or if you find a virus, kill the process. You can type MSCONFIG in the Run window (found in the start menu) and click the Startup tab (i can't verify the name of the tab since I'm on a MAC right now, but its the tab on the far right) and turn off unnecessary programs not required for your computer to start. Dont forget to run anti ad ware and spyware programs. Do basic computer maintence, such as DiskCleanUp and Defragmentation. Do all of this, and try playing the game again. Also, make sure you have all of your windows updates and your game has installed any patches and updates from their website.