avast! here, on Home Premium x64 too.

It's handy, doesn't take a lot of memory & has great On-access Protection.

I use Vista x64.
I also use NOD32 3.0 as it has the smallest footprint (system resource use), fastest, most accurate, and most thorough scanning and cleaning. It also provides antimalware/antispyware protection. Product Software updates are free upgrades. You can back up config setting if you tweak for maximum protection, and It has also consistently won more VB100 awards, and other Independent testing awards than any other antimalware/antivirus vendor out there. 3.0 is also a native 64-bit program, as opposed to many that are 32-bit running in windows on windows emulation.

For those interested in antivirus security, or If you are just looking for a program that will actually protect your computer(s), you should check out this link.
Most antivirus/antimalware programs are tested periodically by independent (non-biased) security organizations to see how well they perform. testing on the Vista SP1 platform was performed a few months ago by Virus Bulletin who awards the VB100 Award to those antimalware vendors that meet their high standards: (1. It most not miss any "In the wild" malware, 2. It must not give "false Positives", 3. It must do all this in it's default configuration out of the box).
note-"In the wild" means malware currently circulating and infecting systems. "false Positives" is the detecting of malware, that is in effect not malware.



http://www.vistax64.com/system-secur...es-vendor.html

avast! just ignored a virus and now my installation was almost gone, I wiped avast! and installed NOD32, which did find the virus and deleted it.

-1 vote avast!
+1 vote NOD32

Hi Rive,

The virus definition database may not have been updated at the time they ran these tests. I'm sure that Avast and the others will catch up when they have their definitions updated. I use the free version of Avast, and have not had one virus yet.

Hmmm, seems foolish for an antivirus vendor hoping to recieve a VB100 Award to submit its program without up-to-date virus definitions.

Also, most of the good antivirus programs use advanced heuristics, and do not solely rely on virus definitions as that is reactive, and means that the program cannot protect against new, and unknown malware threats.