SymptomsOn Parallels virtual machine start you can see the following error message:
Unable to find the parallels driver for USB devices
CauseParallels .kexts can not be loaded because of wrong Mac permissions.
1. Open Terminal.app on your Mac (Applications/Utilities/Terminal)
2. Paste the command as is into Terminal and hit return (you will be prompted to put your Mac password):
sudo chown root:admin /
3. Once you have run this command - restart your Mac