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Acceleration tab suddenly became grayed out [Win7]

Posted: 10. Feb 2016, 01:19
by Skiv398
Hello !

Enabling the computer today and get to work, after a while realized that my system is somehow turned off virtualization (this is proven by Speecy and AIDA program).

So i couldn't start my Virtual Machine because of error.
Then i went to the settings and found out that acceleration tab suddenly became grayed out


The first thing I went into the BIOS and checked VT checkbox is included there, but everything is in order and worth the value "Enabled".

I decided to first shutdown and restart the computer, and then further to include all again, but it did not help.

Yesterday, oddly enough, everything worked perfectly and without any problems, and it's hard to imagine that such a sudden could suddenly occur because nobody has touched my pc.

Prompt, please, what it can be, and how to solve it?

Motherboard - Asus Sabertooth p67
CPU - Intel Pentium g840

Re: Acceleration tab suddenly became grayed out [Win7]

Posted: 10. Feb 2016, 01:54
by socratis
Do you happen to run Avast? Then, see: viewtopic.php?f=6&t=76191
Otherwise, take a look at I have a 64bit host, but can't install 64bit guests for some more general guidelines.

Re: Acceleration tab suddenly became grayed out [Win7]

Posted: 10. Feb 2016, 02:10
by Skiv398
Oh, also i use Win 7 [x32] VM

VirtualBox 5.0.14

and my system is Win 7 [x64]