F-SECURE Internet Security 2010, 1 Year, 5 Users, Upg. Software type: Upgrade, License quantity: 5 user(s), Number of years: 1 year(s). Minimum hard disk space: 600 MB, Minimum RAM: 512 MB, Minimum processor: Intel Pentium III 600 MHz. Compatible operating systems: -Windows 7 -Windows Vista (64-bit, 32-bit) -Windows XP Home, Windows XP Pro, Windows XP Media Center