Cant play old home movies on a DVD RW on my pc or dvd player

Hi,
Some years ago I used a pinnacle editor to copy old home movies from VHS tape to DVD RW discs. I cant get them to play on my pc or dvd player with "error" signs coming up.
I would be grateful if someone could perhaps advise me on how to access the movies as I don't have the VHS tapes any more to try and copy again,
All help greatly appreciated.
Tom