I just installed the Windows 8 Release Preview on the Samsung slate that we attendees got at the MIX last year. After installing I get a 'MS-DOS'-type error message
+---- Secure Boot Violation ----+
Invalid signature detected. If this error persists, seek technicall assistance.
I've tried hitting F5 when the slate boots at the time the Samsung logo shows (according to some documents that should give a recover option), but that doesn't help.
Any suggestion is very welcome as I now have a nice brick.