**WARNING** If you have an IBM PC AT and you have installed a nonstandard (16Mhz) crystal DO NOT attempt to install software protected by Softguard using the normal procedure. Such products include dBase III and other programs which use the installation counter technique. Apparently, the installation procedure is critically dependent on the clock and will clobber the source diskette during installation. The sympton of a damaged diskette is the message "unable to run on this machine." Temporarily reinstall the 12Mhz crystal before installing the software. Not only will installation be impossible on the AT, but it will also be impossible on any other machine. The exact nature of the damage is unknown to me at this time, but the effects sure are! I am not certain that this is the only problem with Softguard and the AT, so beware. I understand the Softguard's "creators" are addressing the problem, but don't count on any helpful announcements. Lou Barnett