after the Windows 10 Fall Creators Update (October 2017) VirtualBox doesn't launch existing VMs anymore.
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VT-x is not available (VERR_VMX_NO_VMX).
Fehlercode: E_FAIL (0x80004005)
Komponente: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}
I disabled Hyper-V virtualization, though:
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dism.exe /Online /Disable-Feature:Microsoft-Hyper-V