This problem can be caused by incompatible graphics hardware or settings on your computer, as well as by another application that is taking up a high percentage of system resources during the time that the game is loading. Our real-time games are designed to yield priority to other applications, so that they won't affect system performance or other running applications. If another application is consuming a high percentage of CPU resource, it can cause problems during loading, because the game can't get sufficient system resources to load properly.
You should check the Windows Task Manager and see if there are any applications that are using a high percentage of CPU (other than System Idle Process, which is OK). The easiest way to do that is to click twice on the column heading "CPU" in Windows Task Manager (once sorts from low to high, so you have to click a second time to easily see the tasks with the highest CPU usage).
We have had reports that some versions of McAfee Spam Killer process consume excessive CPU resources and can cause this problem. The specific application appears as MSKSrvr.exe in Windows Task Manager. If you are experiencing that problem, you should seek assistance from McAfee. If Windows Task Manager shows no applications that are consuming excessive CPU resources, please let me know.