Symantec Norton Internet Security Premier Edition (NU) 2009 - 1 User, 3 PC - Upgrade - NL. Software type: Upgrade, License quantity: 1 User, 3 PC. Minimum hard disk space: 400 MB, Minimum RAM: 256 MB, Minimum processor: 300 MHz. Compatible operating systems: - Microsoft Windows Vista Home Basic/Home Premium/Business/Ultimate