I had very few (none I can remember) problems with Civ4. After installing and playing Warlords, I am getting random reboots of my system. Sometimes it will lockup instead. I have an ATI X1900XL running a little overclocked. I have the latest drivers (Catalyst 6.6). I have no problems running things like Titan Quest or other games for 12 hours a day (recent vacation). So I do not believe it is a problem with my system. At least not yet. Need to play more Titan Quest and find out. 
I checked the Event Viewer and nothing shows in there from just before the reboot. (It shows tons of stuff after the reboot of course.)
Is anyone else experiencing this?
MB: Asus P5ADT2-Premium
CPU: Intel (cannot remember model number)
Graphics Card: ATI X1900XL
RAM: 2GB

I checked the Event Viewer and nothing shows in there from just before the reboot. (It shows tons of stuff after the reboot of course.)
Is anyone else experiencing this?
MB: Asus P5ADT2-Premium
CPU: Intel (cannot remember model number)
Graphics Card: ATI X1900XL
RAM: 2GB