Windows 8 has a new layer of security that builds in the SmartScreen filter from Internet Explorer right into Windows itself. If you don’t like that idea, here’s how to disable it.
Editor’s Note: The SmartScreen Filter included in Windows 8 and probably should not be disabled, as it helps prevent malware infections. This article is intended for educational purposes only.
Disabling the SmartScreen Filter
Open up the classic control panel, and select the System and Security link.
Now select the Action Center option.
Once you are in the Action Center expand the security list, and scroll down looking for the Windows SmartScreen option. Once you have found it click the change settings link.
You will most likely be prompted by UAC to enter your password, now you can totally turn off the SmartScreen Filter. Change the radio button from the default to the bottom option.