Failed to start the virtual machine

Binary package hint: virtualbox-ose

Failed to start the virtual machine WinXP.
VirtualBox can't operate in VMX root mode. Please disable the KVM kernel extension, recompile your kernel and reboot (VERR_VMX_IN_VMX_ROOT_MODE).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {0a51994b-cbc6-4686-94eb-d4e4023280e2}

ProblemType: Bug
Architecture: i386
Date: Sun Nov 29 15:14:25 2009
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
NonfreeKernelModules: wl nvidia
Package: virtualbox-ose-qt 3.0.8-dfsg-1ubuntu1
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
SourcePackage: virtualbox-ose
Uname: Linux 2.6.31-15-generic i686
VirtualBoxOse.DpkgList:
 ii virtualbox-ose 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - base binaries
 ii virtualbox-ose-qt 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - Qt based user
 ii virtualbox-ose-source 3.0.8-dfsg-1ubuntu1 x86 virtualization solution - kernel module
XsessionErrors:
 (gnome-settings-daemon:2078): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:2078): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:2245): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:2212): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (gnome-panel:2211): Gdk-WARNING **: /build/buildd/gtk+2.0-2.18.3/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window