Running Windows 7 Professional SP-1, I discovered I am unable to create a new user profile, and unable to log on to the guest account if it is turned on. The main administrative user account is working. If I create a new user account, and try to log on, I am logged on to the default account instead, with messages that "settings.ini is in use by another process" and "user profile service failed the logon. User profile cannot be loaded." The registry only shows the working administrative account, and there is no key for the newly-created account. If I try to log on to the guest account, the same error messages appear. I don't have a restore point. A screenshot of the Event Viewer is attached.