VT-x features locked or unavailable in MSR when starting virtualbox

Today I have faced above problem. i solved it by following way.

Server info
================
Host Server : DELL powerEdge R710
Processor : Six core


Solution:-
=============

Entering into BIOS Manager> System Setup > Processor> Visualization  = Enable


then Save & exit


"A common misconception about 64bit hardware: Having 64bit hardware/cpu does NOT mean you have VT-X/AMD-V as well, in other words: yes you can run a 64bit OS on 64bit hardware as a HOST, but a 64bit GUEST NEEDS VT-X/AMD-V to be active and enabled."



VirtualBox needs "VT-x" support when virtualizing multicore.

error: Failed dependencies:libSDL-1.2.so.0()(64bit) is needed by VirtualBox-4.2

Cause:-
=======
Dependency error when installing virtualbox 4.2 to linux 6.1 OS


Solution:-
========
when you face above error, you should install two rpms like follows [you can get it from your OS DVD (/media/RH../Packages/)]

SDL-1.2.14-2.el6.i686.rpm
SDL-1.2.14-2.el6.x86_64.rpm



[root@localhost Packages]#
[root@localhost Packages]# rpm -Uvh SDL-1.2.14-2.el6.i686.rpm
warning: SDL-1.2.14-2.el6.i686.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                ########################################### [100%]
   1:SDL                    ########################################### [100%]
[root@localhost Packages]#
[root@localhost Packages]#
[root@localhost Packages]# rpm -Uvh ^C
[root@localhost Packages]#
[root@localhost Packages]# rpm -Uvh SDL-1.2.14-2.el6.x86_64.rpm
warning: SDL-1.2.14-2.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Preparing...                ########################################### [100%]
   1:SDL                    ########################################### [100%]
[root@localhost Packages]#
[root@localhost Packages]#




If you face below (DKMS) error
==============================

Trying to register the VirtualBox kernel modules using DKMS [FAILED]
  (Failed, trying without DKMS)
Recompiling VirtualBox kernel modules [FAILED]


Solution:-
=========

then, you should download and install the below rpm.

         dkms-2.1.1.2-1.el6.rf.noarch.rpm


http://pkgs.org/


Oracle VM VirtualBox Download
------------------------------
http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html