Trend Micro Titanium Maximum Security 2012, 3u, 1y, WIN, FRE. License quantity: 3 user(s), Number of years: 1 year(s). Minimum hard disk space: 400 MB, Minimum RAM: 256 MB, Minimum processor: 350 MHz. Compatible operating systems: Windows 7 (32/64-bit) Windows Vista SP1+ (32/64-bit) Windows XP SP3+ (32-bit)