First off let me say this question is being asked with the assumption that computer specs meet all the recommended specs for the game.
When I had purchased Black Ops from Steam for PC my computer went well beyond the recommended specs, but I had all sorts of problems occur such as crashes in the game causing it to force quit itself, as well as having the game screen go to a bright yellow and not returning to the game itself.
What are the differences between the various ports of the game?