Administrators: Members of this group are local administrators and have complete access to the workstation. They can create accounts, modify group membership, install printers, manage shared resources, and more
Backup Operators: Members of this group can back up and restore files and directories on the workstation. They can log on to the local computer, back up or restore files, and shut down the computer
Cryptographic Operators: Members can manage the configuration of encryption, IP Security (IPSec), digital IDs, and certificates
Event Log Readers: Members can view the event logs on the local computer
Guests: Guests are users with very limited privileges. Members can access the system and its resources remotely, but they can’t perform most other tasks
Network Configuration Operators: Members can manage network settings on the workstation. They can also configure TCP/IP settings and perform other general network configuration tasks
Performance Log Users: Members can view and manage performance counters. They can also manage performance logging
Performance Monitor Users: Members can view performance counters and performance logs
Power Users: In earlier versions of Windows, this group is used to grant additional privileges, such as the capability to modify computer settings and install programs. In Windows 7, this group is maintained only for compatibility with legacy applications
Remote Desktop Users: Members can log on to the workstation remotely using Terminal Services And Remote Desktop
Replicator: Members can manage the replication of files for the local machine. File replication is primarily used with Active Directory domains and Windows servers
Users: Users are people who do most of their work on a single Windows 7 workstation. Members of the Users group have more restrictions than privileges