I've been running Microsoft security essentials and its a sweetheart. Its quiet does not nag, installs in 4 min, and when it detects something bad it gives you a binary choice. Destroy or leave it alone. i've given it to allot of my friends and they love it as do I. MS finally got this one right not like dont er one care. If your like me i dont want to be screwing around with settings. Do your job and shut up. By the way the best part is, r u ready? Its free
Can get it off of connect. Microsoft.com. Enjoy
Bob