HI
I have burnt to a disc using Ashampoo burning studio 14 several PDFs. I am using windows 7. They open up fine and can be read. I then put it  in another computer which uses windows xp and they read fine. No problem. But when I gave the disc to a friend to test on his work computer he insists that it does not work. I sent him an PDF from the disc by email and that was fine but I have now burnt 3 discs and each ONE does not work on his system. He deal s with PDFs regularly due to his work and they open with out a problem. Please can anyone advise what is wrong.

Thank you.
RodMost LIKELY his optical drive then since i'm sure he has PROPER PDF readers as you stated if he works with them all the time.

I've seen CD/DVD drives from different PC's do this...rare...but it happens.I AGREE with PATIO.  Since the disks can be read fine in your machine and the XP machine but not in your friend's work machine the odds are that the drive in that machine is the issue.  One other thing to ask, is your friend sure the drive in the work machine a DVD drive?  It might be only a CD drive.