I just made a backup cd of halo:combat evolved. First I used CloneCD to make the files into a .ccd and then i used ultraiso to convert .ccd into .iso then i burned it on a cd. All succefully. I tried to see if it will work and it started up Halo but it gives me a pop up "Cannot locate the Halo CD-ROM" and under that it states "please eject and re-insert the Halo CD-ROm, select OK and restart application". Please help, why is this not working?