[Wilum]

I'm on a Windows 7 machine now, and use Microsoft Security Essentials for my anti-virus software. It is hands down, the best anti-virus program I've ever had.

Dittos what you said. I have four machines set up with MS Essentials, two with Win 7 and two with XP,and virus/malware free for 18 months.

[Windflier]

My wife still runs XP on her computer. After I set up MS Security Essentials on my own computer, I set it up on hers, and it’s worked like a charm on both.

I’ve had my gripes with that company in the past, but I’ve got no complaints with that product. I give it high marks.