This service is responsible for loading and unloading user profiles. If this service is stopped or disabled, users will no longer be able to successfully logon or logoff, applications may have problems getting to users' data, and components registered to receive profile event notifications will not receive them. Fix: (1) GPO: Computer Configuration\Windows Settings\Security Settings\System Services!User Profile Service (2) REG: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\ProfSvc!Start