Total Defense Anti-virus Plus 9.0: Professional-grade anti-virus and anti-spyware protection for home and home office users. Guards your pc from worms, trojans, and other malware that can slow down or even damage your pc. Easy to use interface. Protects 3 computers. Works with:Windows 7 (32/64bit), Vista (32/64bit), XP (Service pack 3 32 bit only) or Home Server.