If you get this error, the most likely cause is that your license file has become corrupted. You should try re-copying the backup copy of PCAWIN.LIC from your distribution diskette to your PC Access executable directory.
If you continue to get this error, try deleting the PCAWIN.LIC file from both your PC Access executable directory and your "PC Access for Windows - Disk 1" (be careful not to delete any other files from your PC Access diskette). Re-run PC Access; the Register PC Access for Windows window should appear. After you re-register your copy of PC Access, PC Access will create a correct license file in your PC Access executable directory, and back it up to your "Disk 1."
If this message continues to appear, follow the instructions for an Internal Error.