It is important to know that Intel® Extreme Tuning Utility (XTU) was design to work on Intel motherboards only, not on OEM or other system brands devices.
The version you installed on your laptop is compatible with Windows 7 and Windows 8 operating system. We do not have a version compatible with Windows 8.1 yet.
As far as I know, you should be able to uninstall this utility under device manager, programs and features.
Since you are not able to, you may check if you can restore your computer to the last working state by choosing “System Restore” once you’re in Windows.