Check if your Internet Explorer is running in 32-bit mode:
1.Go to Internet Options, select the Advanced tab
2.In the Settings list scroll down to Security section and verify that the Enable Enhanced Protected Mode check box is cleared. If it´s not unchecked, uncheck it.
3.Restart your system.
Enhanced Protected Mode is a security feature that was introduced in Windows 8 and is now enabled by default in Internet Explorer on the Windows 8.1. Enhanced Protected Mode isolates untrusted web content in a restricted environment that's known as an AppContainer. EPM is an additional layer of protection. If you switch this feature off because you need to use an add-on, the overall security is still on the same level as was in the previous versions of Windows.