I have a new Compaq Presario Desktop computer that uses the Windows Vista Home Premium OS. When I finish reading my email messages (in Earthlink WebMail) I would like to play a game offline but don't know how to disconnect from the Internet to do so. From the START menu, I see the options Log Off, Lock, Restart, Sleep, Hibernate, and Shut Down. Which one should I click that would get me offline and yet not turn off the computer. Any help is welcome. Thank you.