 If a user is a member of the Power Users group, he or she has greater chance of exposing the system to malware over a normal user and can promote their account to an Administrator by purposely installing malware.Thus, the Power Users group should be used with trustworthy and knowledgeable users only; it is not suitable to contain untrustworthy users.The Power Users group has been removed in Windows Vista as part of the consolidation of privilege elevation features in the introduction of User Account Control.