Video staggering/stalling
 

Today I was watching a movie and at the end the video started staggering/twitching (sound is OK). I opened a new file, and now this twitching was present from the beginning. I opened the third file (which was OK several hours before) and the same.

I tried different formats (avi, mp4,...) and there is problem with video in all. I unistalled the BP and installed a fresh-one. No improvement.

But I can watch videos with Microsoft Player with no problem.

I'm using Windows 7 / 64.