If you get and RTE 2 in the pi when you try to save the counts or you try to save after a count, its becasue the command.com path is wrong. If you are on winnt, just delete wssetup.dat and go into prefs and remake it. This will default the dos path to c:dos and you should be fine. You cannot just go into default directories and change it to c:dos because it will try to create the folder and not find command.com. You must either delete wssetup.dat or rename the ws folder.
If dos, win95,or wiin98, just find command.com and set the paths accordingly.