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In some situations, users may encounter problems when logging in to a Windows 7 PC or Vista PC. Microsoft’s Knowledge Base article KB947215 lists three different ways to fix it; however, such fixes do not apply to new user accounts. In the event the error is being generated by a new account, such fixes are useless.
“The User Profile Service failed the logon” error message workaround:
Logon to the PC with an existing administrator account and check the “Application” event logs. Mainly, look for error sources “User Profile Service” and “User Profile General” or Event ID 1500, Event ID1509, or Event ID 1511. Such errors are caused by conflicting permissions of certain files and folders that may have been added by applications to the “Default” profile folder.
When observing the details of Event ID 1509, for example, the logs tell us which files and folders are causing the conflict. See image below.
To fix the problem, navigate to the folders containing the files and grant the appropriate permissions to the conflicting files (grant the “Everyone” group full control or inherit permissions from parent folder). Once this is done, reboot PC and login with the new user account. It should work correctly.
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