When the application is closed, it generates a GPF.
Versions of XVa3 before version 3.5 build 11 required TCP/IP to be installed on the computer. If a computer did not have TCP/IP installed, then the application generated a GPF while trying to clean up its unused TCP/IP sockets.
Upgrade the application to version 3.5 build 11 or higher or install the TCP/IP protocol on the computer.
For more information on installing the TCP/IP protocol on your computer, please consult the Window's documentation.