I have had three windows XP Pro SP3 Systems get infected today April 21, 2010 within a half an hour of each other. We are running McAfee Antivirus total virus defence. The syptoms are as listed in the title: "A possible infection: No start button, Task Bar tiny grey line, All services stopped and cannot start, no netlogon" The system reports that it will reboot in 15 seconds then continues with many failed reboot attempts. When it finally restarts the Start button is gone the task bar is minimized so that you cannot see it and services are all stopped. There is no networking support and no ability to start services. When I reboot in safe mode the conditions described above still exist. We have run the normal antivirus, anti spyware, antimalware on these systems be remving the drive and attaching to an isolated good system. All tests come back clean with no report of problems. Any advice is welcomed.