Windows 8 Metro App's "Can't Open"

Solution 1:

I had the same problem but I resolved it, I found that the antivirus Firewall was the cause, it blocks all metro apps to connect to the network, disable it or change the Firewall rules.

Solution 2:

Metro apps won't start if the screen resolution is less than 1024x768, is this your case?

It happened to me when I was running Win8 in Virtualbox http://www.dandandin.net/what-to-do-if-windows-8-does-not-run-any-app.aspx