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#1
are u sure its not the video source that pixelated?
btw anything related to playback is mostly related to codec beside gpu-driver
try use VLC and see if you see similar issue
if either VLC and media player reproducing same issue, then usually the video is broken
Its a Intel HD 4400, other pc has even lower spec.
I have just reverted back to Windows 8.1 with latest drivers and it seems to be OK, Think I will be sticking with 8.1 for a few more months.
It must be the Windows Drivers causing issues.