Oxford English Dictionary Second Edition on CD-ROM (version four). I have not encountered any problems using this version of the software in standard user mode on the Microsoft Vista operating system. The ability to operate software in standard user mode is an important improvement on version three, given the problems an Amazon customer reported with version three. Software is easy to use. It is easy to enable and disable pronunciation, spelling, etymology, and quotation.
You only need to authenticate the software the first time it is used. You may receive the message "unable to authenticate original disk within the time limit", but just keep trying until authentication is completed.