[Quall999]

If your dvd burner only supports burning dvd+r's, then don't switch for dvd-r's. It's probably the software your using. I never burned dvd's with Nero, so maybe it doesn't support burning dvd+r's. Look for a Program called PrimoDVD, or Record Now. I know thay can burn both + and - dvd's.

Marshin, your burner can only burn to what it supports. Look on the box or go online. It should say what kind of dvd's it supports burning.
If it only supports dvd-r's, then you can't use dvd+r's. If it supports dvd+r's, then you can burn to dvd-r's. If it supports both, then you can use either of them.