i'd reinstall dominions, just in case there's something corrupt with it. When do you get the blue screens? during new turn calculations or while viewing battles or what? If the latter, I'd certainly look around for updated video drivers.
I'd think a driver issue would be the most likely cause of a memory parity error. d/l and run from a pre-windows environment either microsoft's memory tester or memtest86. Dell's own hardware tests are fairly weak; probably because they like their under-warranty hardware to pass it
