New-be wanting to make back-ups/copies of his games pls HELP

[darklighUK]

Hi I'm a new-be to CD-copying.

I own a selection of reletivly new games, and have a small (3 machine) LAN and as such woould like to host deathmatches and other such multiplayer games.

One prob, when I copy ST:VOY - EF, I can install from the disk, but when i go to play the came to play the game , it rrequests the original CD. The same prob occurs with Dioablo

pls help