I don't know much about this although I do know that compressed files can cause CRC data errors. Try a google search for the error message that you're getting. Also send an e-mail with your problem to [email protected] They should be able to help as they are a UK computer magzine and very professional. Technical problems seem to be their speciality. Just make sure you put your name & address and PC spec in the e-mail as you may get printed in the next issue of the mag. It won't cost you a penny.