Thank you Olimpia for your reply.
Well, I think i made some fatal mistake. I tried to use "add source". I thought it will make additional source in the library. In fact, xbmc has deleted all my original nfo files (thanks G-d I have only 20 movies in the library yet). It still informed me it can not connect to remote server.
Here to prepare the log, I have added movie "let sleeping corpses lie" to the Movie folder.
Additionally, I made "add source" again to see what is going wrong in the log file.
Regarding the network:
here is how it set up in xbmc
Allow control xbmc via HTTP - checked
port 8080
username xbmc
Allow programs on this system to control xbmc - checked
Allow programs on other systems to control xbmc - checked
Anounce these services to other systems via Zeroconf - checked
use http proxy server to access the internet - unchecked
here is a full log file:
http://pastebin.com/A03QZvk4 by name xbmc full log
Thank you again for your help.