Vista has a funny way of handling the "program files" folder.
A separate programs files folder is created for each user.
This can make it VERY confusing when you copy files around.
My guess is that you maybe accidentally copying the wrong files from your vista machine.
My suggestion would be to install KA to the root of your c: drive (ie c:\Kirby Alarm Pro)
When you do the copy of the data files (ie those that end in TPS. eg alarms.tps, alarmlog.tps) plase make sure that KA is not running on the destination computer. Otherwise windows will complain the file(s) is in use.
This is just a suggestion, but to try and automate the process a little, why not get KA on your source computer to email the TPS files to an email address that resides on the destination computer.
That way, once a month, you would get an email with the data files and it would act as a reminder to you to copy the files to the destination computer.
I hope that helps. If not please just let me know.