What are some of the PC "must haves" in your opinion?

Some of mine include:

Sims 2

Bioshock (Which very sadly hardly runs on my laptop )

Counterstrike: Source

What are some of yours?

Doom

Doom II

Diablo II

Witcher

Quake III (or Quake Live)

Team Fortress 2

Left 4 Dead

Company of Heroes

Half-Life

Half-Life 2

Some good entries so far..but we can't forget Fallout 1 and Fallout 2. Baldur's Gate I and II..and my darkhorse fave, Planescape Torment.

Fallout 1+2

Call of Duty 4

Team Fortress 2

Left 4 Dead

Monkey Island 1+2+3

FEAR

STALKER: Shadow of Chernobyl

Knights of the Old Republic

half life 2

one of the gtas

mafia

crysis

one of the total war series

Deus Ex

Half-Life 2

Team Fortress 2

Elder Scrolls III: Morrowind

Elder Scrolls IV: Oblivion

half life

half life 2 and hte episodes

starcraft

crysis and crysis warhead

company of heroes

tf2

Half-Life 1-2

StarCraft

WarCraft 3

Deus Ex

SystemShock 2

Dungeon Keeper

The Longest Journey

NOLF 1-2

Fallout 1-2

Baldur's Gate 1-2

Homeworld

FreeCell and Minesweeper.

half life

deus ex

fallout 2

vice city

age of empires

unreal tounament

system shock 2 if it worked like the previous game do....

the rest aint a must but i never played daiblo3 baldurs gate and i havent messed enough with planescape torment or neverwitner nights to know...

from the new ones perhaps the orange box,

mass effect,

witcher

fallout 3

bioshock,

or a bit condemned

OR why not cod 1 and the expansion and soldier of fortune or unreal 1 and 2 and red faction 1 and , perhaps all the doom games

The orange box (TF2, Portal, half life 2)

CSS

COD World at war

• Company of Heroes
• Rome and Medieval II: Total War
• Homeworld 1
• Deus Ex 1
• Call of Duty
• System Shock 2
• The Operative: No One Lives Forever
• Rise of Nations
• Warcraft 3
• Starcraft
• Vampire: The Masquerade Bloodlines