Can you burn regular data? If you can't burn ANYTHING, you may have a defective writer, or a reader with NO burning capability.
Are you using the burning ability offered by Windows itself?
If yes, try using some other burning application. Many are available for free. Do a search for "DVD burner" AND free.
Maybe you have a CD/DVD reader. A reader can't burn anything.
Maybe your CD/DVD writer is deffective.
Get and install a new DVD writer. They are relatively cheap. If available, an OEM version is very good and cheaper: As it come in a simple anti-static bag, you save on packaging and from the absance of bundled applications that you don't realy need.