Hmmm... I had a similar program a year fews ago, with Ultima IX. Game worked perfectly except for ONE SINGLE THING that would cause my computer to lock up and need a manual reboot. Reinstalls didn't help, starting a new game didn't help, nothing seemed to help until I got a new video card and power supply.
There may be some sort of hardware incompatability, perhaps it would be worth contacting GW support and asking if your video card is incompatible. If there's no issue there, I'd suggest going ahead with a PSU upgrade.
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