Hey thank you guys for your advise.
I have found the solution to the problem. It was the software, Nero the latest version, and I have tried a new program called dvd clone and it has worked perfectly.
Whats more there was no error messages at all and the dvd discs I was using are now trouble free. I have burned six movies. The problem seems to be Nero and so I would recommend anyone having too many problems with Nero to try dvd clone or 1 click dvd copy. The burn process is easy and it burned the movies I downloaded from the internet, legally of course.
So I am now burning away a very happy bunny Thanks again for the advise. Here is the site where you can get info for the above programs.