virtualbox.org

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.

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.

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

Great! Glad you're up and running.