id summary reporter owner description type status component version resolution keywords cc guest host 14512 Windows XP guest OS does not start John Rose "I'm using Ubuntu Trusty. Under VirtualBox 4.3.10_Ubuntu R93012, my other OSs (e.g. Debian, openSuse) startup OK. However, Windows XP (my only Windows OS) starts up OK but then displays a window with details of NS_ERROR_FAILURE (0x80004005). Carried out install of VirtualBox 5.0.2 from LocutusOfBorg's ppa (https://launchpad.net/~costamagnagianfranco/+archive/ubuntu/locutusofborg-ppa/). Once I'd removed old Extension Pack & installed Extension Pack 5.0.2 from Oracle's site, Windows XPp & other guest OSs started OK. It's OK on my desktop as detailed above. However, I've just tried the same updates on my laptop. It installs VirtualBox 5.0.2 & its Extension Pack OK. However, starting Windows XP gives a slightly different error: Failed to open a session for the virtual machine WindowsXP. Unsupported version 56 of data unit 'PATM' (instance #0, pass 0xffffffff) (VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION). Result Code: NS_ERROR_FAILURE (0x80004005) Component: ConsoleWrap Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed} PS this is logged on Launchpad (for Ubuntu) as bug 1489279" defect new other VirtualBox 5.0.2 Windows XP Windows other