FRAMINGHAM (02/02/2004) - Ctrl+Alt+Delete inventor David Bradley is retiring from IBM Corp. after 28 years. The engineer, one of 12 who created the IBM PC, needed a way to restart the computer without turning it off. On a panel with Microsoft Corp. founder Bill Gates to celebrate the birth of the IBM PC, Bradley quipped, "I may have invented it, but Bill made it famous." Gates didn't laugh.