There are a couple of things that can cause this..... so lets start the process of elimination.
Firstly i need to know what computer it is.... Just basics.... Laptop / Desktop. If its P4. What OS (win XP / Win 98 etc)... what antivirus....
This problem is very common on Windows XP with Service Pack 1 loaded.
The following solution is only for windows XP with SP1. (with service pack 2, its all fixed up already)
To sort out this problem, apply the following patch from Microsoft.
Patch Also try to update your
Direct X to version 9.0c After that run the diagnostix and make sure that all the tests does not have any problems. (to run the tests, click on start... click on run.... and then type in DXdiag... In the utility that opens up, you can run all the tests available in there and see the results.... )
Also there are a major amount of hidden programs that can affect your computer's performance and stability.... they can infect files, causing your computer to restart when it cannot overcome an error. If you are not sure if there are other hidden programs running that may interfere with the game, download and install Spybot. This will remove most unwanted programs that crawled onto your computer without your knowledge and that has negative side effects to your computer’s stability.
Spybot Let me know if any of these make a difference.... otherwise we move on to the next level of trying to find the problem....