The PSA Accounting Setup Program installs files from the Setup Disk to your hard disk, if you had PSA Accounting or any version of PSA Accounting with billing already on your computer and going to upgrade, then before running setup, you should make backup copies of your installed software.

Log to CD-ROM drive then copies all files to your hard drive in your own folder and makes a shortcut for that. After the compellation of installation you have to reboot the machine.