This error indicates that you are trying to run PC Access on a different computer than you originally installed it on. This error can only occur if you used an Alternate User Authorization when you originally installed PC Access. Normally you only need to use the Alternate User Authorization when the PC Access user authorization is incompatible with your computer.
To get around this problem, delete the PCAWIN.LIC file in your PC Access executable directory. Run PC Access again. This might solve the problem. If you get another error message instead, you will probably have to follow the instructions for an Internal Error.