Cause of the problem is that the seriel port (COM1, COM2, COM3 , COM4) is conflicting with your MODEM or other divice. To solved the problem do this.
1. Get a computer with NO MODEM, NO SCANNER. 2. Copy the Pansat load programs. 3. Connect the seriel cable. 4. Execute the load program and start selecting COM1, COM2 until you get the right one.
In some cases it could be the seriel cable. Replace with the correct one.