Morning, blackbox solutions do a tool for the EAS system that plugs into the socket on the passenger side, don't know if this is what you need https://blackbox-solutions.com/shop/ eas kicker
So, tell us if you are using the EAS software from RSW, if so, I assume you are also using a USB to serial adaptor or a USB lead fom Ebay? If you are and are using Vista it may well be a driver problem for the USB.
Oops, can never remember who has one of mine. Most likely it's a problem with the USB drivers.
Make sure you have the correct driver for the USB to serial adaptor loaded before you plug the adaptor into the PC.