ccleanwr gave me BSoD on win 8.1

So yeah, I'm typing this on my phone because after using the registry cleaner once, I rebooted to the BSoD. I am currently being forced to restore my system and was just wondering what in the hell happened? How can I find what file it removed that caused this?

did you do the suggested "Do you want to backup changes to the registry?" before doing the reg clean?

if yes, then in the saved .reg file will be what it removed and a hint as to the fault.