One of the classic Blizzard games, Warcraft 3 + Frozen Throne give you the fun of battling Orcs, Elves, Humans, or the Undead Swarm.  Games typically range from army vs army, a cooperative tower defense, or a mario brothers type race car game.

Pretty easy to install and setup, just install Warcraft 3 and Frozen Throne then touch battle net to get the updates.  If you don't have this, we recommend the battle chest, you can either purchase online for download or delivery or pick it up your favorite software store.