Just more ammo...

Not programming related, but useful to know... Recently, our PC's at my work has been randomly giving the error “User profile service failed the logon. User profile cannot loaded” message. If a user had logged onto the machine prior, they could log on, but if the person had not logged on before, they may or may not be able to log in. The below steps will resolve the issue.

1. Run Windows Explorer with Administrative Rights (You may have to login as the local admin.)
2. Browse to C:\Users
3. Tap ALT, then Tools, then Folder Options.
4. Select the View Tab
5. Select Show hidden files, folders, or drives
6. Click Ok.
7. You should now see Default in the list of users.
8. Right Click on the Default, select Properties.
9. Click on Security
10. Click on Advanced
11. Click on Change Permissions
12. Check the 'Replace all child object permissions with inheritable permissions from this object
13. Click OK all the way out.
14. It will prompt you to change permissions, click OK (or Yes).
15. Log out and users should now be able to log in.

#14 above may be different, but that’s what my recollection of it is.