64bit - VirtualBox: VERR_VMX_MSR_VMXON_DISABLED -

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yesterday created first virtualbox vm (v4.3.28)! learned in order run 64-bit os (in case, windows 7), needed enable virtual technology (vt) in bios/uefi (intel i7-3770k). set vm snapshot, , continued turn on until after rebooting physical computer. receive following error , no longer see 64-bit os options:

failed open session virtual machine <name of vm>.  vt-x disabled in bios. (verr_vmx_msr_vmxon_disabled).  result code: e_fail (0x80004005) component: console interface: iconsole {8ab7c520-2442-4b66-8d74-4ff1e195d2b6}

i found several posts this, solutions have been (1) enable vt via bios (as still is) , (2) enable virtualbox option under settings>system>acceleration. regarding latter, unable access acceleration tab (the tab gray). not sure how proceed. discussion appreciated! thank you.

acceleration tab greyed out because vm not powered off. cannot change such settings if in saved state.

if still have snapshot, recommend removing , configuring vm afterwards. else, you'll loose configuration if restore it.

if still doesn't work, couple of things check:

  • make sure enable vt-x , not other vt. vt-d exists per exemple, not need.
  • after enabling vt-x, full power off. vt-x not enabled on simple reboot or bios settings save.
  • double check hyper-v or vmware @ startup - lock vt-x , virtualbox not able use it.

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