For all those that have quite some Bootskins and use the Random Option in this application there is a very big chance that this can cause a BSOD at startup.
I've had the problem after installing some 10 or more additional bootskins, on top of some 15 that I already had.
It is only by chance that I came across this issue since I do no often reboot, but mostly use the sleep function.
Luckily I remembered that Bootskin could be the problem; and after some 15 BSOD's and several Restore Options that did not work to my surprise, I thought I'd disable the Bootskin app. while being in Safe mode.
Righthereafter I could login normally. I suspect the same could happen while having too much LogonScreens and also using the Random function.