The underlying error is that there is a cookie domain mismatch, not a port conflict.
You need to set mosConfig_live_site for whatever you want *other* people to be able to access your website as. Joomla uses mosConfig_live_site when determining your cookie domain. The reason you see "Cookies are not enabled" is because Joomla creates a session cookie for "localhost" in the users browser- it then checks to see if it exists (silly, I know, but computers are generally silly) so it asks your browser if it has any cookies for this site. Your co-workers computer looks underneath the ip address they entered, "roizpc/Joomla", and responds "Nope!", and Joomla's default error is "Your cookies aren't enabled then, because I just created a cookie!".
Your computer, unfortunately since it lacks sentience, is not able to search underneath "localhost" and see "Oh, there is a cookie there.."
So, if your ip address on your LAN is 197.123.44.123 (just pulling these out of my ...) , then mosConfig_live_site should be:
$mosConfig_live_site = "
http://197.123.44.123";
In your case, it should be:
$mosConfig_live_site = "
http://roizpc/joomla"
This is of course, assuming that "roizpc" evaluates to your IP on your LAN, which is something that your network admin would configure.
Good luck!
