If it worked fine during the trial, it should work now, given the amount of information you have provided, its really hard to give you any advice. Does your drive work with other programs, have you tested it, I have been using CloneCD for years and never saw a message like that. Is the error message from CloneCD or Windows? These drives were put into Acer Notebooks along time ago and have many problems, I wouldnt rule out the fact that it doesnt like the media. Try another brand like Verbatim or Taiyo Yuden.