If you Don't care which windows app was located where when you are shutting down the system, this tip may in fact help improve the shutdown time a bit (a bit not too much)..Simply inform windows not to save the settings at exit time. To do this , open registry by going to START-RUN and entering regedit. Navigate to [HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\Explorer] .

In this look for value of "NoSaveSettings". If available, do one of the following:

If you want to enable no save on exit, set its value to 1 else to save on exit. set it back to 0.