I have been in the same situation. I rooted my phone Sony Xperia and it kept restarting. I reset it via the recovery menu and Kinguser was still there and I finally got rid of it. Do these steps and you will have your phone working again:
- Go to Google
- Search for Kingoroot
- Install Kingoroot for Android
- Click "root" at the bottom
- Your phone will reboot and Kinguser is gone
- Android 4.2.2 is working again
