I don't care about 3rd party metro applications, but i can't enter "Computer Settings" either..
When i enter control panel/User Accounts/ and click to "add a new user" some metro ui tries to open and it gives an error. (It doesn't give any technical information about error)
After my investigation, i found out that in services.msc "AppX Deployment Service(AppXSVC)" is not running. It's startup type is set to Automatic but it's not running. When i try to start it, it gives this error : "Error 1058: The service cannot be started, either because it is disabled or because it has no enabled devices associated with it." But it's not disabled..
I tried Sfc /scannow command in CMD it didn't find any error.
Edit: I know there are lots of questions like this but my problem is slightly differs from them.
check for updates
option off to the left bring up any indication that some updates are available?