When Microsoft launches the brand new Windows RT, the Windows version specifically designed to be installed on tablets, it won't allow users to install third-party antivirus software.
Security companies across the globe have warned that the Redmond-based software giant wouldn't enable users to install other security products on their tablets, pointing out that a security software category is completely missing from the Windows Store.
The desktop version of Windows 8 will allow users to install application not only from Windows Store, but also in the traditional way, by downloading standalone software packages. That's why Windows RT can be distributed with such a limitation.
As compared to the standard Windows versions, Windows RT only lets its users to install apps from the Windows Store and since a security software category is missing, no security product can be installed on the upcoming tablets.