Spider Solitaire is included in all the versions of Windows 7. As such it should appear in Games Folder.
However, if you don’t see the game title, it could be for one of these reasons:
· It's an older game. New games automatically show up in the Games folder when you install them. Older titles might not. To add the game manually, see
Install a game in the Games folder
http://windows.microsoft.com/en-us/windows7/Install-a-game-in-the-Games-folder
· Games are turned off. By default, the games that come with Windows are turned off, in some editions. To turn them back on:
· Click the Start button, click Control Panel, click Programs, and then under Programs and Features, click Turn Windows features on or off.
· Select the Games check box, and then click OK.
Where are my games?
http://windows.microsoft.com/en-us/windows7/Where-are-my-games
This should help you in locating spider solidaire.