Ok, so I've been playing about 30 hours, everything was smooth and fine, but when doing a Dawnguard MQ, and delivering Serena to vampire's castle, her father offers me to become a vampire. I'm agreed, and he just giving me some "lessons" on how to be a Vampire-lord. After that, I need to turn back to human, but when I'm doing this - game just freezes so heavy, that I can't even switch to Task Manager to "kill" it. Only rebooting. Help me, please, I just can't continue my game with this problem;(