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?

4 Answers 4


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)

  • +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, 2010 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.


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.


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


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.