Just had another thought- does the computer that you are trying to install the mats from use a dvd drive instead of an actual cd drive? My wife's notebook has a dvd drive and it cannot always read everything on a cd that I've burned. But it has no problems with commercial cds. I speculate that commercial cds might somehow produce a stronger data "signal" on the cd than our home units. (Home units don't actually "burn"- they colour... I think...) I solve the problem with her machine just by hooking up my portable burner and using it instead.