IndirectX
Check this out: a magazine goes to great lengths to promote a big demo on its coverdisc, but fails to supply necessary driver to run said game. I must have been asleep when Microsoft bought Mechwarrior from Activision, but they're sure going to town with MW4, especially since it requires that blessing/curse of all PC games: DirectX, version 8 being the latest incarnation. PC Player included DX7 on the disc, of course, 'cos that's useful...

...which is why I've to spend nearly an hour downloading 8...not impressed.