If you get FS2002, you will still have to install squawkbox for use on Ivao or vatsim, although Ivao have produced their own system (Ivap). It is just that you need squawkbox relay installed for use with squawkbox on FS2004. You should not experience problems installing.

Tony

You need both squawkbox and relay for 2004. If you go to Ivao site, you will find easy to understand instructions in the software  or tutorials sections. Also d/load a small programme called Host SB.
To try to give you instructions in any depth here would take to much time. It all seems a bit daunting at first, but once installed and used a couple of times, soon comes easy.
I would suggest if you are still unsure, try d/loading Roger Wilco voice (free) or Teamspeak (free) get a cheap headset with attached mike, and someone would, I am sure, talk you through, word for word.

Tony