An user may receive an error “The User Profile Service service failed the logon. User profile cannot be loaded.” when logging on to a Windows machine.
This problem can be solved in two ways.
Follow the steps in this article: http://support.microsoft.com/kb/947215
This solution includes renaming of the registry keys which contain the profile information. If this solution does not work, try the following solution.
The security rights on the ‘Default’ user folder must be corrected. Follow these steps: