Well, sometimes things just stop working.
VirtualBox – error about modules not running + require to run as root:
/etc/init.d/vboxdrv setupWell, Google will at 99% of places recommend You to # yum install gcc kernel-devel kernel-headers And it is help... But if not? Then it recommended to define KERNEL_DIR= Well. sometimes it helps too, but what if not? Well, let's cut here... Here what I found as additional problem on RHEL & CentOS (& Fedora) Nothing help? $ uname -a Do Your kernel have .PAE ? If Yes - then under root: # yum install kernel-PAE-devel and then #