World of Tanks, Rise Of Nations or Age Of Empires III

dragon age is supposedly on pc
never knew that

city of heroes/ villiains

minecraft

team fortresss 2

Half-Life 2.

Long list it is:

Portal
Quake 2
Half Life
Counter Strike: Source
Realm Of The Mad God
Morrowind
Fallout
Fallout 2
Fallout Tactics
Universe At War: Earth Assault
Divinity II
Halo 2 (Good luck finding a copy)
Farcry
Half Life 2
Daggerfall
GTA 2
Star Wars: Empire At War
Warcraft III
Starcraft 1 & 2
Diablo 1 & 2
Elder Scrolls Chapter II Daggerfall
Team Fortress Classic
Amnesia: The Dark Descent
MDK
Demigod

if you like apacolapyse/nuclear war type of game try Fallen Earth if you like casual id recommend Tf2 if you like strategy id say sid meirs civ 5

DDO dungeons and dragons online. its epic!

Garry's Mod

Y'want the long list or short list?

Any others???

Braid is a pretty good game.
I can't really suggest any good ones because my computer is too terrible to game on.

Left 4 dead

Killing Floor, Team Fortress 2,

Portal 2! DD

Amnesia The Dark Descent.

It's pretty fun