Error in Ejecting my Windows 7 Installation Disc

I made a copy of my original Windows 7 installation disc in case I lost it. When I have to install my OS due to some issues, I used the copied disc to re-install Windows 7 but it doesn’t play and I can’t eject it also. I tried hitting the eject button on my optical drive but the error below just showed up. Is this an issue with the disc itself or with my optical drive? I need advices please.

Microsoft Windows
An error occurred while ejecting ‘DVD RW Drive (G:)’.
