Recently when I updated my Virtualbox from 5.0.10 to 5.0.12 and 5.0.14, all the VMx weren't able to start, with an error message about vt-x unavailable. It took me half a day to realize that it's Avast who did the trick.
However I couldn't find anyway to make Avast to allow Virtualbox to use the hardware vt-x.
Found a workaround here: (but I haven't tried the solution yet)
"Open Avast, go to settings-> Troubleshooting and uncheck “Enable hardware-assisted virtualization” then restart your PC"
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