Suddenly unable to boot any VMs

[widonwaker]

Hello,

I've been using VirtualBox for 5 years or so, never had problems. Recently, I did not start any VM in the latest 3 weeks. Yesterday I tried to start a VM and it failed after a few lines of text. I tried all my VMs and all the same.

I attach here part of the VM logs (since the whole file is too big to upload here). Can you tell me what happened? I didn't even change a PC hardware component from last time it was all working fine.

[scottgus1]

Zipped logs always fit. And the good stuff was in the other half.

Search the far left tab's log for this text:

Attempting fall back to NEM

If you find it, Hyper-V is enabled and needs to be disabled. See HMR3Init: Attempting fall back to NEM (Hyper-V is active).

If you don't find that text, save the far left tab's log, zip the log file, and post the zip file, using the forum's Upload Attachment tab.

[widonwaker]

Somehow a recent windows update enabled Hyper-V stuff. I disabled it and it worked again. Thank you very much.

[scottgus1]

Great! Glad you're up and running.