I have 3 pc's in a training room displaying same systems. All three are in constant reboot loop. PC's display normal XP splash screen with progress bar then screen flickers and show please wait windows 2000 box. I can boot in safe-mode and OK but safe-mode with network also displays windows 2000 screen and reboots. Sophos virus scan and malwayebytes come back clean. Any thoughts and suggestions are greatly appreciated