Thank you for answering Mr. Colbert.
Yes I have tried another disk. This time I used Windows to write
the files to the DVD. It said there was an error?
When I go into Windows 7 to check the DVD drive it tells me the drive is working.
My first attempt was with Infarecorder and that failed.
Sometimes after I erase the DVD with Erase DVD, then look at properties to see if the DVD has been erased it shows all zeros.
I have to shut down to computer and start it up again and then looking at properties the correct values show.
I know my explanation is lacking. I am not sure if the problem is with the DVD drive, Windows 7, the mix of programs on the computer, the DVD disks or any combination.