An unsigned driver is just that. It doesn't mean that there's a problem with the driver.
Also, choosing the wrong settings in Driver Verifier can result in your system becoming unbootable - it's not a tool to use unless you're prepared to do a full recovery "just in case".
The "proper" result of an investigation with Driver Verifier is that you'll get a BSOD with more information on the particular driver that caused the crash. If this occurs early enough, you won't even be able to get into Safe Mode to disable the Driver Verifier settings.
The information that refers to the little red x's in the Reliability Monitor is the information needed to start troubleshooting this. The last one in that screenshot is a driver related message stating that a driver corrupted your memory. If you did get a BSOD after enabling Driver Verifier, you'll have to perform an analysis of the memory dump file according to these directions: http://www.bleepingcomputer.com/forums/t/176011/how-to-receive-help-diagnosing-blue-screens-and-windows-crashes/
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