I have it for about 8 years it's the best game ,but recently I tried to use it again I don't have the cd or the source files ,but the installed files do exist (copied from program files after re-installing windows) now it doesn't seem to play ! It works but when it comes to play I have that (debug) message of course I can't debug ,how can I resume playing ?

Why don't you get the entire game via Torrent or Rapidshare in iso form (not portable - not all portables work). Mount the iso on Daemon Tools and forget the CD's