Trouble running VirtualBox on Ubuntu

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http://askubuntu.com – I want to run VirtualBox on Ubuntu, it used to work a while ago but I can't remember when or why. However when I double-click on an OS to run, it tries to start - opens a window for the virtual OS, gives the "host key" message, but then 5 seconds later closes the OS window and gives this error: Failed to load VMMR0.ro (VERR_SUPLIB_OWNER_NOT_ROOT) Result Code: NS_ERROR_FAILURE (0x80004005) Component: Console Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb} If I run it with sudo virtualbox I still get the same problem. I've tried sudo apt-get purge virtualbox then sudo apt-get i (HowTos)