Error message changes

Some error messages have been removed and reused, and others that had been unused previously have now been assigned. The list of messages appears below:

120 UDP not available - unable to load Winsock
147 Invalid or duplicate IP address or port number
195 Error sending or receiving on UDP
435 NetBIOS not found or insufficient NetBIOS resources available
436 Failure or unexpected error from NetBIOS
465 Operation cannot be performed while connection is active