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I am trying to install OS X with VirtualBox, on my Windows 7 laptop. I see the following error message:
VT-x/AMD-V hardware acceleration has been enabled, but is not operational.
Certain guests (e.g. OS/2 and QNX) require this feature.
Please ensure that you have enabled VT-x/AMD-V properly in the BIOS of your
host computer.
After this message, the boot fails with a critical error.
I am using Lenovo X201 Tablet as the host machine.
What should I check and how can I fix this?
Do you have TXT enabled in the bios? – Paul – 2011-10-21T03:46:48.733
@Paul I enabled it and now it is working! I am installing Mac OS X... Thanks! – Chang – 2011-10-21T03:56:38.027
Interesting. I was expecting you to tell me it was enabled, and I was going to answer with "disable it" in order to get VT-x working. I guess they updated the bios. How do you want to close off this question, shall I answer it anyway and you'll accept? – Paul – 2011-10-21T03:58:57.487
You can self answer your own question and mark it as the correct answer :) if you wish – Simon Sheehan – 2011-10-21T04:01:50.883
1@Paul Oops, it wasn't TXT; I enabled something else, callsed "Intel Virtualization Technology". – Chang – 2011-10-21T04:15:47.730
Cool - just for the record, can you tell me if TXT is enabled or disabled? – Paul – 2011-10-21T04:35:41.950
@Paul I don't know what TXT is, but Intel Active Management Technology is disabled. Intel VT-d Feature is also disabled. – Chang – 2011-10-21T05:09:16.540
Trusted eXecution Technology - it should be an option there somewhere - it can interfere with vt-x. – Paul – 2011-10-21T05:10:54.073