How do I Back up my original pc games?

Hi !
I just burn about 4 games all was copied sucessfully , Installs sucessfully also but when I pop in the back up copy its telling me please insert the corect CD-ROM & restart aplication the games I copied were nhl2001 , The Ultimate hunt challenge The 3 game pack which is DeerHunter pheasant & Turkey Hunt.
Hope someone out there could help.
I look forward to all who replies
Thanks In Advance "lightning"