My PC gets formatted often so I usually always have a random assortment of games. Currently
Unreal Tournament 3
Battlefield 2
Supreme Commander
Battle For Middle Earth
Star Trek Armada 2
Morrowind
Oblivion
Crysis 2
Call Of Duty 4
Shift
Shift 2
On my 98 PC
Mechwarrior 2 Titanium pack
Mechwarrior 3
Descent 1, 2, 3
Descent Freespace
Starcraft 1 + Broodwar
Flightsim 98
Deus Ex
Falcon 4.0
Final Fantasy 7/8
Need For Speed 3 Hot Pursuit
Metal Gear Solid
Nox
Daggerfall
Arena