defective product

In November 2001 I purchased a custom CD-Rom of names and addresses from a mailing list company. After I installed the product, my computer froze, and excel didn't work. I called my computer company's tech support, and they had me delete all the files associated with the CD-Rom installation. When I called the company which sold me the CD-Rom data, they denied responsibility. After repeated attempts to get satifisfaction, I notified my credit card company of this dispute. They agreed with me, and cancelled the charge. However, the CD-Rom company has since sent the credit card company their license agreement which stated that the customer cannot export more than 100 records from the CD and get a refund. As I did export more than 100 records, they are saying I am responsible for paying the $720 fee. I exported the data in good faith that my computer would work with this data, and not shut down. Since I could not use this data, why am I responsible? The CD rom company originally agreed to allow me to access this data from their web site instead of using the CD, to which I agreed, however, they never sent me an access code. I do not know what to do next. I can't understand why I should pay $720 for data I could not access, or use, to say nothing of having my computer down for 2 weeks trying to fix excel. Please advise! Thank you in advance.