problem installing virtualbox on centos with xen enabled kernel

Today, I tried to install virtualbox 4.0.4 on centOS 5.4( unfortunately that was what I got from my company ). Installation went fine, But after i created a virtual machine and tried to start it, I got this error,

Running VirtualBox in a Xen environment is not supported

The problem was with centOS install. centOS installs xen enabled kernel by default. So I installed normal kernel from repository.

yum install kernel.x86_64 kernel-devel.x86_64 kernel-headers.x86_64

We have to configure grub to boot normal kernel by default and not the xen kernel. Set the parameter “default” to point to normal kernel. Now reboot!

After the kernel is up, execute the following command,

sudo /etc/init.d/vboxdrv setup

If everything goes fine, You can now start the virtual machine.