I tried to access the acceleration tap under system under settings and I can not. The tab is greyed out like their is no data available.
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Only if your CPU (which?) supports VT-x/AMD-V you need to make sure you had enabled it in BIOS. Some older CPUs (e.g. some Core2 Duo, Atom, etc.) may not support this. – Takkat Apr 30 '14 at 06:45
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If the corresponding Virtual Machine is running then the options under acceleration tab(Settings->System->Acceleration) would be grayed out.
So poweroff the virtual machine in-order to enable Hardware Virtualization(intel vt-x).

Avinash Raj
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the machine is powered off but the tab is still greyed out. my processor does not support vt-x – user276133 Apr 30 '14 at 05:23
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If you have :-
- VirtualBox's error - something likes " VT-X is not available".
- Host os is 64 bits with more than 4 GB of ram.
- Guest os is 32 bits
Lest's try to reduce VirtualBox's base memory to be under 4 GB.

mrlamud
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