I recently tried to use VirtualBox to run a Virtual Machine on my new laptop which is a HP EliteBook 8530w. But after attempting to start the VM I encountered the following error: Power up failed (vrc=VERR_VMX_MSR_LOCKED_OR_DISABLED, rc=E_FAIL (0X80004005))
So as per the return code, this is telling me that VT-x is either locked or not enabled. It can't be locked as this is running on Windows 7 which does not have any other virtualizer running, i.e. VirtualPC or Hyper-V. It is enabled as I explicitly set virtualization in the BIOS. It turns out that I needed to also enable Txt Technology. Once Txt Technology was enabled, the VM fire-up! nice
I am not normally a VM person, but my new laptop is a beast. 8Gb of RAM so I can allocate 4Gb to the VM and it runs like a host OS.