You might want to make sure you meet the system requirements: see them at the end of this post. Although the beta of Windows 7 is not officially supported, I successfully installed Forefront and tested it with the eicar test file.
If you meet the above requirements, download the image from here: http://www.microsoft.com/forefront/clientsecurity/en/us/trial-software.aspx
(it won’t expire in 120 days, but if you like it, you should definitely buy it!)
Mount the ISO or burn it to a CD/DVD.
Then, from an administrative console (type “cmd” in the Start menu and then right click on cmd.exe and choose “Run as Adminitrator”, go to the CLIENT folder on the virtual drive or the CD/DVD you just burned. Execute ClientSetup.exe with the /NOMOM parameter:
(do not ignore the administrative console thing, or your installation will fail).
You should get the confirmation a few seconds later:
Go to Windows Update (Control Panel -> Windows Update in Windows 7/Vista, or Start -> All Programs -> Microsoft Update in Windows XP SP3) and check for updates. You must install the Forefront update and the Forefront definitions update.
It’s now time to REBOOT your computer.
As a last step, it’s recommended that you test the realtime protection with the antivirus test file.
Congratulations! You have a fully functional antimalware product installed.
700-megahertz (MHz) or faster processor
256 MB of RAM or more3
350 MB or more hard drive space
Windows® 2000 Professional with SP4 and Update Rollup 1
Windows 2000 Server with SP4 and Update Rollup 1
Windows 2000 Advanced Server SP4 and Update Rollup 1
Windows 2000 Datacenter Server with SP4 and Update Rollup 1
Windows XP Professional with SP2 or later
Windows XP Home with SP2 or later
Windows®°XP Tablet PC Edition with SP2 or later
Windows Server 2003 with SP1 or later
Windows Server 2008 Standard or Windows Server 2008 Enterprise
Windows Server 2008 Standard Server Core or Windows Server 2008 Enterprise Server Core installation
Windows Vista® Business, Enterprise, Home, or Ultimate Windows Vista Business, Enterprise, Home, or Ultimate with SP1 Servers running Terminal Services are supported as client computers. x64 (except Itanium) operating system installations are supported for client computers. Windows 2000 Server, Windows Server 2003, and Windows Server 2008 clustered nodes are supported as client computers.