Thanks for your help chickenman

The problem was that the AC3machine was creating silent Ac3 files. So I used another program named "ffmpeg" which i downloaded from here

I have now sucessfully got my DVD files (working) and I am waiting for my NEC 2500a from SVP, when i recieve it i will straight away be able to burn the files with CloneDVD or Nero

Thanks again,

Chris