You need to supply a debug log so we can see what's going on.
Incidentally, if the "green button" means the Windows button, this sends Win-Alt-Enter and you can't override this in Windows, though you could in Linux.
Enable debug logging from System settings, System, Debugging, and restart XBMC then wait a minute or two for all the startup tasks to finish. Press the green button on your remote a few times, then close XBMC.
Open the debug log by pressing Windows-R and in the Run dialog type:
"%appdata%\xbmc\xbmc.log"
(including the quotes). Click OK and the log should open in Notepad. Copy and paste the log into
http://pastebin.com/ and post the link it gives you here.
JR