You mean the clasical Minesweeper, Solitaire, Freecell, etc?
They should be in the Windows directory I think.
If not, they aren't installed.If that is the case then put your windows cd in, and go to control panel in Add/Remove under Add/ remove Windows components on the left side. Under Accesories click details and you'll see Games. Click it , click ok and next to install from cd.