Can't burn dvds

  honeysuckle 17:16 02 Mar 09
Locked

I am trying to burn files to a dvd but when I try to copy to disc I get a message to put a disc in the DVD drive even though there is one in. I have checked and the drive is enabled. What am I doing wrong. Also when I copy files to my external drive they copy over but when I try to copy them back they are not recognised.
I want to backup before I reinstall windows.
Help!!!

  Diodorus Siculus 20:30 02 Mar 09

Please provide some more details:

operating system

DVD burning software

type of external drive / files you are trying to copy across

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