bitdefender Antivirus 2011-3pc/2yr for $19.99

Minimal System Requirements: Operating system: Microsoft Windows XP SP3 (SP2 for x64), Vista (SP1), Microsoft Windows 7. Available free hard disk space: 1 GB free space CPU: 800MHz processor. Memory (RAM): 512 MB (Microsoft Windows XP) / 1 GB (Microsoft Windows Vista and Microsoft Windows 7). Recommended System Requirements: Operating system: Microsoft Windows XP SP3.