I have a save game for a large map that reboots the computer after I select a city improvement.
After setting AGP to 0x, the game no longer reboots the computer. However, the game is still unplayable. It takes 2 and a half minutes to load the save game and the first time I hit end turn after loading the game, the game freezes and locks up the computer (mouse cursor still moves but can't tab out or ctl-alt-delete).
P4 2.4GHz
XP SP 2
1 GB RAM
ATI All-In-Wonder Radeon 9600 XT