|"I need to know how to fix it! Not what it causes!"|
That is exactly the point of the links provided. You need to know what is causing it in order to work out the correct fix for your circumstances.
It is usually a problem with drivers. In your case probably the graphics drivers.
You do not help yourself either by mis-quoting the error message. irql_not_less_or_equal
You have not provided us any information on your system ( other than it runs XP)
Nor have you told us which particular game you have that seems to trigger the problem. There are many possible causes for your problem and as many possible answers. You need to do some research in order to work it out and when seeking help on an open forum you have to provide full information. Asking a one-line question usually elicits a one-line answer.
Goin' Fishin' (Some day)