DVD Drivers disappear after attempting install of NIS

In the middle of installing Norton Internet Security 2012 when I boot up my computer I get a message that says A problem has occured that needs your attention. This process is unable to continue because a CD or other media source was removed or disconnected. To continue please re insert or reconnect and press Next. Whenever you press next the window reappears

I checked and my DVD Drive no longer shows up under My Computer.  I'm installing on a 64-bit Windows 7 Home Premium laptop.  What do I do now?