I'm working at a school with 200 student owned Windows 7 laptops. We regularly get the "The User Profile Service service failed the logon. the user profile cannot be loaded" error on the student accounts . I can fix the issue by logging is as another user, and applying the registry modification as described here http://www.vistax64.com/tutorials/130095-user-profile-service-failed-logon-user-profile-cannot-loaded.html (change refcount and state of the .bak profile back to 0, and rename to get rid of .bak). However, I'd like to know what is causing the issue in the first place. The issue is intermittent and I can't replicate it. Where should I be looking and what should I be looking for?

This is nothing to do with the built in Administrator account.

Hi, I would like to share you the following Microsoft Knowledge Base Article: Error message when you log on to a Windows Vista-based or Windows 7-based computer by using a temporary profile: "The User Profile Service failed the logon. User profile cannot be loaded" This article explains the issue in detail. Regards,Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

technocrate often lifts posts of questionable relevance from other threads and drops them in others (sometimes, with a questionable link appended). In your case, the post by "Ken - Former Support Engineer" was lifted from http://social.answers.microsoft.com/Forums/en-US/vistasecurity/thread/0986bf48-62b1-474e-9eca-d34603920f07 and dropped here.

This has nothing to do with profiles being manually deleted. I know how to fix the issue; but I still don't have any answers as to why it is happening in the first place, and how to prevent it.