4K playback issues

Hello so I recently bought a 75" Hisense 4k TV (75m7000uwd).

I have connected my PC to it via HDMI and all my files play fine except when I try to play 4k files.

the files I have are:
2160p.4K.UltraHD.BluRay.(x265.HEVC.10bit).2CH.AAC
2160p.UHD.4K.AC3.x264

My PC specs are:
http://speccy.piriform.com/results/wFmjc02cLuOy0cT8icfTq5A

I have tried to use MPC, VLC and WMP but its all very jerky and the audio is way out of sync.

Any Help?

Your computer is not capable of smoothly playing the first file. That is 10bit HEVC. At 4k resolution, even the fastest CPUs aren't fast enough. You need hardware acceleration to decode that, and your system is too old for it. Your system only supports 8bit HEVC.

The second file should be playable with hardware acceleration enabled.
LAV Video decoder settings > Select "DXVA2 (native)" hardware acceleration and enable it for H.264 and HEVC