Documents cannot be opened in desktop UI on storage device

when i am able to open my Oracle Virtualbox it can't open on my ubuntu 10.10 it says

Failed to open a session for the virtual machine Backo.
The virtual machine 'Backo' has terminated unexpectedly during startup with exit code 1.

Details :

Result Code:
NS_ERROR_FAILURE (0x80004005)
Component:
Machine
Interface:
IMachine {6d9212cb-a5c0-48b7-bbc1-3fa2ba2ee6d2}

Kernel driver not installed (rc=-1908)

The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. Please reinstall the kernel module by executing

'/etc/init.d/vboxdrv setup'

as root. Users of Ubuntu, Fedora or Mandriva should install the DKMS package first. This package keeps track of Linux kernel changes and recompiles the vboxdrv kernel module if necessary.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: gvfs 1.6.4-0ubuntu1.1
ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
Uname: Linux 2.6.35-24-generic i686
Architecture: i386
Date: Fri Jan 7 16:37:52 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: gvfs
Symptom: storage
Title: Documents cannot be opened in desktop UI on storage device