This product cannot be installed on a computer, therefore it has to be run from the CD. There are several "flaws" in the software, for instance, the most basic element is the ASL alphabet, but several of the letters (in the alphabet), do not display, so I don't know the signs for the letters: Q, R, J, P, and M. There are 4 disks (Hypersign, Fingerspelling & Numbers, Sign Language Dictionary and Basic Signs) but since the Sign Language Dictionary has to be inserted in the drive for the program to run, it is impossible to use the other disks. There isn't a manual, and I can't find directions, instructions or guidelines (on the disk) to explain how to use the program. After spending nearly 2 hours going through all the FAQ's, I finally sent an email to Technical Support, and the reply I got, was "Check the FAQ's". I will never make another purchase from "m-2k". This purchase is "Money down the drain".