virtualbox.org

Hi there! Yesterday my system suddenly turned off because of the SSD gone dead. All my VM were in the second HDD drive, so i thought all going to be all right. Ha-ha. It wasn't. While system was working, all my VM were working too. Now I'm trying to power them on and get an error -"VT-x is disabled in the BIOS for all CPU modes". That isn't true. I checked BIOS again and this setting is on. Then I decide to check settings of my VM. In the processor tab i can't change number of cores and i can't change the acceleration tab either. Do you have any ideas what do I need to do?

I'm guessing you reinstalled Windows and enabled Hyper-v in the process.

Try going through the FAQ below. And don't assume anything. When checking the BIOS make sure not to confuse VT-x with VT-d.

Related FAQ. FAQ: I have a 64bit host, but can't install 64bit guests.