Starting three days ago, Norton Internet Security stopped starting when my wife's computer (Lenovo Thinkpad, Windows 7 Pro) was booted. No error message, it just wouldn't start. Fixing the problem each morning requires a full removal and reinstall. She shuts down at end of day and the scenario must be repeated the next morning. She is a light user and has installed no new software in over a year. Any tips on what to look for will be appreciated. For info, my computer is identical to hers and I do not have the problem. Thanks,