Parallels Desktop 8 on Mac OS X 10.9

Terminal - go to Applications/Parallels Desktop/Contents/Library/Extensions/10.6

sudo kextutil prl_hypervisor.kext/
sudo kextutil prl_vnic.kext/
sudo kextutil prl_hid_hook.kext/
sudo kextutil -d ./prl_hypervisor.kext prl_netbridge.kext/
sudo kextutil prl_usb_connect.kext