This tool allows users to install the National Security Systems (NSS) PKI root, intermediate and subordinate CA certificates into their Windows and Firefox certificate stores. InstallRoot 5.2 is packaged with a command line version as well as an InstallRoot service, which can check for updated Trust Anchor Management Protocol (TAMP) messages that contain the latest certificate information from DoD. The following operating systems are supported: Windows XP, Vista, Windows 7, Windows 8 and 8.1, Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2. This version should only be run on machines connected to Secret networks, and is only available from the DoD PKE SIPRNET site.