I'm running XP SP3. When my computer starts, I see the taskbar flash on and then disappear, and the same thing happens when I try to launch the explorer.exe process from the command line. This also happens in safe mode. All system checkpoints from before the start of this problem have disappeared so I can't do a system restore. I've run malwarebytes and not found any viruses. I can launch individual programs from the command line (which I start from task manager), so that is what I'm doing for now. If anyone has any ideas on how to fix this I would greatly appreciate it.