Just tried to install parallels desktop on rhel5. package: parallels-desktop-4.0.6630.449744.run default rh5 kernel: 2.6.18-164.el5xen additional: ovzkernel-2.6.18-164.11.1.el5.028stab068.5 both compilations give following error in the log FATAL: Error inserting prl_hypervisor (/lib/modules/2.6.18-164.el5xen/extra/parallels/prl_hypervisor.ko): Operation not permitted Cannot load module 'prl_hypervisor' Any suggestion here?