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VirtualBox shows me the following runtime error message: "cannot access the kernel driver!" What can I do?

Fri, 08/12/2011 - 08:15 — Daniel Lombraña...  (Updated July 2013, BS)

(This is a Windows problem only).If you get that error it seems like your VirtualBox installation missed installing the vboxdrv.inf driver. Please first try to reinstall VirtualBox - if this does not solve the problem, go to C:\Program Files\Oracle\VirtualBox\Drivers\ and double click in the file vboxdrv.inf. After that, you should be able to run VirtualBox without problems.