Buy new DVD-Rs
Old thread, but this is the top hit on google for the problem, so I thought I'd add my solution.
I had problems with several DVDs/CDs in a row, but all were old ones that I'd had lying around for years (worked in my old machine, last I checked).
Got new DVDs, and burned first try.
So, buy a new DVD before trying anything drastic.
The working ones are verbatim 4,7gb.16x dvd-r, but i'd guess new vs years old is the issue.
Note: I tried the silly language fix above. It doesn't do anything.