System Hangs at libvirtd During Boot

[Jaskaran Virdi]

Hi
I've done the yum update for Centos 6.4 by accessing it through the root account.
After reboot I'm stuck at the Starting libvirtd daemon.
I've tried step 1 and failed.
Basically I'm having
Starting the VirtualBox Guest Additions [FAILED]
Now what do I do?
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