Custom scaling of a game

[BlueTemplar]

So, I have this great game, Dungeon Keeper, that runs at 640*480. And I have a 1680*1050 display (with an ATI card).

I was wondering, is there a way to run that game at exactly four times its resolution : at 1280*960 centered with black borders around. So the game should appear sharper compared to stretched to X*1050. How would I do that?

The closest thing I've found was to use a Virtual Machine, but I'd like to find a way to do it without a VM.

Thank in advance for your answer.