McAfee AntiVirus Plus 2010, 3 User, UPG, NL. Software type: Upgrade, License quantity: 3 user(s). Minimum hard disk space: 250 MB, Minimum RAM: 512 MB, Minimum processor: 1.00 GHz. Compatible operating systems: Microsoft Windows 2000 (32-bit) w/ SP4 Windows XP (32-bit) w/ SP2 Windows Vista (32 / 64-bit)