The amount of disk space needed to install the game depends on the game client. Here is the approximate disk space needed for each client:
Trials of Atlantis: 2.24 GB
Catacombs: 2.89 GB
Darkness Rising: 3.91 GB
Labyrinth of the Minotaur: 4.18 GB
To check how much Hard Drive space you currently have available, double click MY COMPUTER, right click on the drive letter that Dark Age of Camelot is installed on and click on PROPERTIES. In the General Tab you will see how much Hard Drive space is USED and FREE.
If you do not have enough free space on your Hard Drive you will need to remove some programs off your system. The best and safest way to do this is to click on START, SETTINGS, CONTROL PANEL. Once there, click on ADD/REMOVE PROGRAMS. Find a program that is seldom used, click on it and click on ADD/REMOVE. Continue this procedure until enough Hard Drive space is available for you to install Dark Age of Camelot.