In the past week to 10 days, I've had at least 8 Windows 7 systems (mix of pro and home) come in with User Profile Service failures. Some have needed system restore to run and others have simply needed a reboot when this is experienced. I cannot for the life of me determine a common denominator to this. It's a mix of AMD and Intel, all have been running clean (no adware/malware). After getting the systems to boot ok again you may go for a random number of cold starts/reboots and boom it happens again. I am not finding any chatter on this. Can anyone shed any light?