Have you got the error when installing Windows Essentials on Windows Server 2012 R2 ?
Microsoft Security Essentials cannot be installed on your operating system.
Your version of the Windows operating system is not supported by this program.
Error code:0x8004FF04
1. To get around this error message, right click the mseinstall.exe file and select properties.
2. From the properties window, select the compatibility tab. Within the
compatibility tab tick “Run this program in compatibility mode for:”
under Compatibility Mode and select Windows 7 from the drop down box, as
shown. Click OK to continue.
3. f you were to run the mseinstall.exe file at this point, you would receive a different error as shown below:
In order to resolve this, run command prompt as administrator and enter
the folder where the mseinstall.exe file is located. Run the
mseinstall.exe file with the /disableoslimit flag on the end as shown
below.
4. The installation wizard should now correctly open and Microsoft Security
Essentials can now be installed and will proceed without the previous
error messages, click Next to continue and work through the installation
wizard.