In case you're not as network savvy as some of these folks, I'll simplify their explanations:
Basically, to RAdmin to your work computer from your home computer, some sort of hole thru your company's router/firewall needs to exist. Whether that hole is a port forwarded to your machine (or another machine, so you could connect to yours using connect through host), or a VPN, or something more esoteric like the SSH suggestion mentioned, depends on your company network, its existing set up, and how much control you have to make changes in the config.
Oh, wow, I just looked at the dates on these posts. I suppose you've either fixed this or given up by now. Well, if not, post again and we the people will continue to try to help.