A: A VMware vCenter Server 5.0 instance relies on either a Windows domain user account or a built-in SYSTEM account for certain activities. When an Active Directory domain user account is used, that account must be granted three rights on the vCenter Server. It must be a member of the Administrators group, and it must have the permissions Act as part of the operating system and Log on as a service. Note that the vCenter Server installer grants the Log on as a service right automatically as part of the installation.