Best anti virus for 64-Bit Windows 7 OS

Second that ... The Lady said it like it is.

ad infinitum, ad nauseum!

^

Comodos CIS Free also supports Windows 7 64-bit

I don't want anyone to misconstrue my "ad nauseum" post. It's just that AV and Firewall and internet security threads keep goin' and goin' and goin'. Like the Energizer Bunny!

Reminds of the days when theologians would debate for months on end about the number of angels that could dance on the head of a pin.

I'll say that the two I would recommend would be either Avira or ESET.

AVAST Free is great!

Avast Free is great, especially if you run it with MSE. I've been running the two together for a week now, and have Malwarebytes and SuperAntiSpyware and stand alone scanners. Also, you can click Start, type "mrt", w/o the quotes, and manually run the Malicious Software Removal Tool on demand. A single AV is not good enough these days to catch everything, free or paid. You must have at least one more "on demand" scanner. Why? Because Microsoft downloads us the same security patches as XP and Win 2K. The first three months of using Windows 7, no problems. Then, about a week and a half ago, Malwarebytes found a rootkit that managed to breakthrough all of the "security" that 7 has. And unlike others, I've not disabled any of 7's security features for a performance gain, or whatever reason the user does so. But hopefully, I now have enough AV's and scanners on hand to catch the bad guys. Windows does make superb OS's, but like a car, you must take the responsibility of maintaining it.

Wise words there Cat and i agree 100% mate, so many blame Hardware / Software when something goes wrong without considering how they use them.

I use CA Internet Security Suite coupled with MalwareBytes paid version and happy as can be.

Avast 5 works well in 64 bit os !

I'd never known about the Start/run mrt thing. Just tried it. nifty, don't know how good it is but handy for a quick check.
So much stuff that we never know the OS can do, just undiscovered.

Mike