Re: log folder problem
You need to be logged in as the administrator, then set the whole medieval ii total war folder to 'archive' - right click the folder, choose properties, unmark the 'read only' tick box, click 'apply' and click 'ok'
What registry file are you talking about?
Error log - the default log (system.log.txt) only generates main messages. A change would require an entry in the CFG file. Manual entries in the main CFG fiel get removed at every game start and making the CFG file read only isn't advisable. Mods on the other hand usually have a [log] section in their CFG file where you can set the log to trace.