I'm not having much luck here
leure: Have updated my video card driver as suggested. Tried Spanish campaign again, placed a few units inside towns, moved the RN, went out of room for a couple of minutes as wife was on the phone, came back in and critical error message was waiting on the screen for me.
Video Hardware issue, this is shown because of the nature of the error, and also because you had it spontaneously, while the game was waiting for you, iddle.
This really does not bode well, and it is possible we have to refund you, as for hardware issues, we can't intervene past asking the user to update the driver. Try to use some of the system options, in the Options Window, System tab: Minimum texture size and Minimum Memory usage, it can helps.
Sorry for the trouble.