Someone please help me. I just installed 8.1 on my Samsung Series 7 Chronos laptop and it's now unusable. All I get after a reboot now is a blank screen and a vanishing cursor. I can't do CTRL+ALT+DEL or any other button combination. I also can't seem to be able to do a system restore as a restore point doesn't seem to exist for some odd reason. I've also tried the boot into low res mode but I get the same result. The only thing that seems to work is booting into Safe Mode with Networking but that doesn't allow me to install/uninstall anything so it's pretty much useless.