I have Vista on my computer and installed the Civilization Chronicles set. I usually play Test of Time and when I play, I occasionally get an error message titled "Wave Out Error" and the dialog box says "There is no driver installed on your system." Clicking on the OK button or the red X to close it doesn't help, it just pops back up. I haven't found anything specific that triggers it - it can happen when I am moving my units, when the AI is moving its units or during my upkeep phase. I can play for hours and not have it happen , or it can happen as soon as after about an hour of play. When it does pop up, the ONLY way to get rid of it is to kill ToT via the Task Manager, again trying to close the error message itself even with the Task Manager doesn't work. I never had this happen when I had Civ installed on my old computer. Any ideas what may be happening or how to fix it?