Thanks for your help - what I discovered was that it was an error in the xml file as ssusca said. I decided to try and ftp the xml file again but this time when having the xbox running and open to e/apps/xbmc. I edited out what I put in yesterday and ftped it to the xbox and the medida center was back!
I still need to figure out how to share but what got me going in this direction was a tutorial from a site that talked about smb sharing but how to edit the xml file was still complicated (obviously).
I also got an e-mail from the guy who modded my xbox and told me this:
"The way I have mine setup is, I share the folders that have my movies on them on my pc (right click share)" - easy enough
"And then I edited the .xml file in the xbmc folder to have a link to my pc" - this is where I run into trouble/confusion
"I created a guest account on my pc with a name and password." - easy enough again
"Then I just used the proper syntax for the link - trouble again here
- with my PCs IP address in there."
As for syntax, editing, etc. does it have to be as it is when I open in wordpad, i.e. so many spaces from the left under a certain bookmark? After I ftped the file to my pc I edited it in wordpad - is that the best way to do it?
Uh, lots of questions but I appreciate your help. Feel like I'm making headway...