Thanks for joining the Graphics community.
I understand your screen looks cropped out under Windows 8.1.
I have noticed that you are currently running an earlier driver version. At this stage, you probably just need to update video drivers to fix this matter.
Please filter by operating system and try to install the driver when it finishes downloading, to verify that your system will accept it.
Is it possible that you have configured Overscan/Underscan in the Intel control panel? If so, it might affect all HDMI displays you connect to...