CWmike writes with a warning that free preview copies of Windows 7 in the wild will start nagging users to pay up in a couple of weeks until ultimately shutting down the PC altogether in a month. "Microsoft unveiled the schedule for Windows 7 Release Candidate's retirement in May 2009, when it issued the early look to the public. At the time, it said Windows 7 RC would expire June 1, 2010. Before that date, however, users are to receive warnings of the impending end. Starting on Feb. 15, Windows 7 RC will display notices every few hours that the machine will periodically shut down beginning on March 1. As of March 1, PCs running Windows 7 RC will automatically shut down every two hours. Those shutdowns will come without warning."