I don't have a 64bit Vista install available to test this on, but at least on Windows 7 if they are using IE, it will say if it's 64 bit in the User Agent string. Your download page could check for the User Agent value and point to the right version. You could also roll your own installer with NSIS or AutoIt that checks the architecture and installs the right version.

Example User Agent from Windows 7 RC (note the WOW64 bit):
Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0)

Michael Grinnell
Senior Information Security Engineer
The American University

AU IT will never ask for your password via e-mail.
Don't share your password with anyone!


On Aug 14, 2009, at 12:08 PM, Jeff Porter wrote:

We need to do the exact same thing, and we are in the same situation...if I'm not mistaken, in 4.1.6, the version we were on prior to 4.6.1, users were identified with a "x64" after their operating system when authenticated and logged in, now, they are all lumped with their 32-bit partners.

The best I can come up with is in the text box where you can communicate instructions/details for the link distribution requirement is to add a couple lines of HTML with links to the specific version of antivirus, but like you said, students may not know what they have or may not read everything.

Let us know if you figure something else out.

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