VIPRE

Note: In case you do not know about Ziff Davis Publishing and CDNET.com, They are the "ultimate in PC computer media credibility."

VIPRE performance shoot-out - Does
it really not slow down your PC?

Sunbelt Software VIPRE

Combined Anti Virus and Anti Spyware / Adware

VIPRE consumes fewer computer resources as compared to the other products. That means your PC runs faster.
New! Family Licensing is available. $49/year for 3 or more PCs in your home.
See VIPRE licensing options here.
Read PC Magazine review here