Hello
I have the same issue!
I was running the Start8 trial and everything was good. When the trial ended, the computer still booted straight into desktop mode. If I press the windows key then nothing happens, I am still in desktop mode. (Actually the window I am working in becomes deactivated, but nothing else visible happens.)
If I activate the charm bar on the right hand side of the screen and push the windows icon there, again nothing happens and I am still in desktop mode.
I then uninstalled Start8 from the control panel, rebooted, and it's still the same as above. I can't get into the modern interface at all.
Please advise on how to restore the original Windows8 behaviour
I am using Win8 (not the preview).