My Windows 8 install was working fine until after some updates installed on 11/16/2012. Since then, I'm unable to start Apps from the Start screen, access the Charms bar, etc. I can get to my desktop by pressing Ctrl+Shift+Esc to launch Task Manager. Once there, I can use my desktop apps, run commands, etc. I have uninstalled the updates, but my Start screen still isn't working.
My problem seems the same or similar to what is described by "Troubleshooting steps to use when Windows apps won't start" at http://www.bleepingcomputer.com/tutorials/windows-apps-wont-start/.
I have tried the suggested ideas except for "Switch to a local account." I am using a "Microsoft" account, and I would like to convert to a local account. I know how to do this via Users in PC Settings, but I can't get to PC Settings from the Start screen. (I have tried accessing via the Charms bar by moving my mouse to the upper-right corner, pressing WinKey + C, and also pressing WinKey + I; nothing works.)
Any suggestions on how I can convert my user account from a Microsoft account to a Local account? For example, can this be done via the desktop or with a command that I can run from the command prompt. Note, I have also tried clicking "Make changes to my account in PC Settings" within Control Panel's User Accounts screen. When I click it though, nothing happens.
Thanks for any tips.