1. go to HKEY_CURRENT_USER,Console,find "fullscreen" modify the value from 0 to 1.
2 go to HKEY_CURRENT_USER,Software,Microsoft,InternetExplorer,Main, "find fullscreen" modify the value from no to yes.
3. reboot your computer.
4. Now everytime you open explorer or IE 6 you'll be running in full screen.
Got this off another tweak site thanks to the author whoever you are!