Kaspersky Lab Upgrade to Anti-Virus 6.0 Personal, NL. Software type: Upgrade, License quantity: 1 user(s). Minimum hard disk space: 50 MB, Minimum RAM: 128 MB, Minimum processor: Intel Pentium 300 MHz. Compatible operating systems: Microsoft Windows 98 (SE) / NT Workstation 4.0 Microsoft Windows 2000 Professional