Solved Win 8 Video app and Flash video in IE10

Hi all, first time post; I'm having severe playback problems with the Video app. Whenever I try to play any video from my PC (avi or mp4), it just freezes on the first frame while the audio continues. If I try to skip it will eventually play properly for 2-3 secs, but then go blocky and freeze again. I've tried playing videos that I rented from Xbox Video, and they play perfectly. All videos also play perfectly on both WMP and VLC. Is it just a very poor app?

I am also having trouble viewing any flash video content in IE10, both Metro and Desktop. Youtube will not play any video in Fullscreen; even at 480p, playback is jerky, with an almost "strobe" like effect on movement. When I was using Vista, IE would quite happily play Youtube videos at 720p in Fullscreen with no issues. If I try to play the front page video on Vimeo, the whole page freezes up. There is no option to disable video acceleration in the flash menu, so I am at a loss as to what else I can try. I have upgrade my graphics card from 256MB to 1GB in the hope it might make a difference, but it didn't. Have just downloaded Chrome and can play Fullscreen 1080p with that no problem.

I was wondering if the two issues might be related? I have looked and looked for Adobe Flash settings all over Windows 8 but can find nothing.

I stream in video's daily in numerous formats. I did install the latest flash player, use the Divx Web Player (only the web player, full divx = borked) and use VLC as well on Win-8/pro 64. No issues with IE-10 and streaming in & viewing.

Did change the IE-10 security to block all pop ups, Internet Options are set accordingly: Security is set to Med-High and Privacy set to Medium.

Hope it helps

Solved this by doing a "Refresh" of Windows 8. Something must have gone wrong on the initial installation, as IE10 now has a bunch of extra options it never had before.