Do site de suporte ,
The Application Experience Lookup Service is a new service that was introduced in Windows Server 2003 Service Pack 1 (SP1). This service is part of an infrastructure that automatically applies software updates to programs to make sure that they run on newly released service packs and newly released versions of the Windows operating system.
The Application Experience Lookup Service must be running for the software updates be applied. You cannot customize the Application Experience Lookup Service. This service is used by the operating system internally. This service does not use any Active Directory, network, or Internet resources.
The functionality of the Application Experience Lookup Service can be disabled though Group Policy settings for program compatibility. When this setting is disabled, the service will continue to run, but no calls will be made to the service. The service cannot be stopped or disabled.