metro apps dont work

hello i had upgraded from win 7 ultimate to win 8 pro.but the 2 metro apps(camera & video) dont work.it will open for a few seconds and turn me on start screen,in ''classic'' desktop windows screen i have no any problem.all my metro apps is updated.i have intel i7 q720 and my grafhic card is updated.what can i do?

Have you disabled UAC?

how can do it?

I was asking if you did. Obviously, you didn't. Metro apps don't work if you disable MVC.

Ok, chances are something went wrong with the upgrade. You can try several things, such as doing a PC Refresh.

http://www.eightforums.com/tutorials/2293-refresh-windows-8-a.html

You may ultimately end up having to do a clean install.

Hello Vasilis,

In addition, here are a few other common items to check. If they don't help, then you'll most likely need to refresh or reset Windows 8.

• If you have a 3rd party AV or Firewall program installed, then uninstall/reinstall it. Sometimes updating it to the lasts version will help if it's not already.
• Double check to make sure that the Windows Firewall service is set to be Running and Automatic.

Hope this helps,
Shawn