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I was searching for a free 64-bit antivirus, since I read somewhere here on SU that its much better for 64-bit systems than the 32-bit version, I have only found 32-bit versions with 64-bit OS support.

Could you point me a free 64-bit antivirus for Windows, and other kinds of software where the 64-bit version outperforms notably the 32-bit version?

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up vote 10 down vote accepted

CryEngine 2's Sandbox Editor (The engine that Crysis runs on) massively outperforms the 32bit version when it can have >2GB of RAM all to itself.

As for AVs, a 32bit antivirus will do exactly the same job. No antivirus will have better results from being purely 64bit. (Windows 7 is notably safer by itself on x64, thanks to some nifty RAM-address tomfoolery x86 builds don't have enabled)

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+1, I guess the AV issue is because of all the IO operations it needs to do, so the HDD becomes the bottleneck. – JL. Jun 17 '10 at 15:52

Photoshop performs better in a 64-bit system. You can see some numbers if you scroll to the bottom here.

Word on the street is that the 64-bit edition of Photoshop is 8-12% faster.

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Try Microsoft's Security Essentials - very well written free antivirus by MS, after Avast and AVG I finally found an antivirus that doesn't slow down computer too much. And it automatically installs 32/64bit version depending on your system.

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2  
-1, not very well written AV. Read this article - readmystuff.wordpress.com/2009/11/28/… – JL. Jun 17 '10 at 15:55
    
@jl - The article does not apply to the current version of MSE. – Ramhound Jan 3 '12 at 20:00

AVAST is 64-bit and can run on 32-bit natively.

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