No One Lives Forever ~ Help!! ~ can't get it to download

[Covey]

"No One Lives Forever" (NOLF) I made a back-up copy of it (using CloneCD) but when I try to use it to install the game, it asks for the orginal disk. Can someone please tell me how to get it to work? I made a .ccd file that I saved in "my documents" and I have Playback21 running (the yellow smily face is there by my clock, and Ihave tried it without the playback21 running) Plus I made a unpatched copy that I tried and got the same error message. I would really appreciate someones help! Thanks!! :-)