dell desktop, win764bit, ns22.7.1.32(latest), ff48.0.2 w/ubo, sandboxie5.12, mbam free. this started friday afternoon. i have set to go into sleep mode after 20 min. now the machine just stays on.afaik, the only changes made were norton and mbam updates.i turn the computer off at night and today i have rebooted several times in a row, but the computer still stays on. any ideas on what has happened? thanks for your help.