Freeze "initializing:video player"

Cubase 8 pro Stops at “initializing:video player”
I have been using 7.5 with no problem. Today I finally updated my cubase but I couldn’t launch it becasu it freeze showing “initializing:video player” . I searched this forum and deleted some files (videoengine.dll…) and I could launch Cubase 8. But I still need the video player in my work. Cubase 7.5 works perfactly in my system.

I use 3 monitors, Amd radeon HD6450(updated), Window7(updated)
I need perfactly working video player in my Cubase8.
What can I do? Please Help me~!!