Can't change kext file ownership from _unknown to root
You might try running the chown command on the whole /System/Library/Extensions/ directory from single-user-mode (hold Command-S on boot, or use -s as a bootflag if using Clover/Enoch/Chameleon), or doing the same thing from the Terminal app in your recovery partition. Also make sure you include su or sudo in front of the command, or are logged in to a fully root shell before doing so.