ubuntu - Xubuntu 11.04 and Nvidia drivers on Dell XPS L502X

I have Xubuntu 11.04 installed. It detected my Nvidia video card and i have the driver, but it says the driver is not in use and i should run nvidia-xconfig

So i ran nvidia-xconfig as root, it backed up my xorg.conf, but when i restart, X doesn't starts. And i get the commands and not the X screen. I have to login in command line and restore my xorg.conf. I have also tried to add BusID "PCI:1.0.0" but it didn't help, X won't start.

Here is my xorg.conf that doesn't work with Nvidia:

Section "Monitor"
Identifier     "Monitor0"
VendorName     "Unknown"
ModelName      "Unknown"
HorizSync       28.0 - 33.0
VertRefresh     43.0 - 72.0
Option         "DPMS"
EndSection

Section "Device"
Identifier     "Device0"
Driver         "nvidia"
VendorName     "NVIDIA Corporation"
BusID          "PCI:1.0.0"
EndSection

Section "Screen"
Identifier     "Screen0"
Device         "Device0"
Monitor        "Monitor0"
DefaultDepth    24
SubSection     "Display"
    Depth       24
EndSubSection
EndSection

Here is the relevant Xorg.log

[    10.761] (II) Module glx: vendor="NVIDIA Corporation"
[    10.762]    compiled for 4.0.2, module version = 1.0.0
[    10.762]    Module class: X.Org Server Extension
[    10.762] (II) NVIDIA GLX Module  275.28  Wed Aug 31 17:15:37 PDT 2011
[    10.762] (II) Loading extension GLX
[    10.762] (II) LoadModule: "record"
[    10.762] (II) Loading /usr/lib/xorg/modules/extensions/librecord.so
[    10.762] (II) Module record: vendor="X.Org Foundation"
[    10.762]    compiled for 1.10.1, module version = 1.13.0
[    10.762]    Module class: X.Org Server Extension
[    10.762]    ABI class: X.Org Server Extension, version 5.0
[    10.762] (II) Loading extension RECORD
[    10.762] (II) LoadModule: "dri"
[    10.762] (II) Loading /usr/lib/xorg/modules/extensions/libdri.so
[    10.762] (II) Module dri: vendor="X.Org Foundation"
[    10.762]    compiled for 1.10.1, module version = 1.0.0
[    10.762]    ABI class: X.Org Server Extension, version 5.0
[    10.762] (II) Loading extension XFree86-DRI
[    10.762] (II) LoadModule: "dri2"
[    10.762] (II) Loading /usr/lib/xorg/modules/extensions/libdri2.so
[    10.762] (II) Module dri2: vendor="X.Org Foundation"
[    10.762]    compiled for 1.10.1, module version = 1.2.0
[    10.762]    ABI class: X.Org Server Extension, version 5.0
[    10.762] (II) Loading extension DRI2
[    10.762] (II) LoadModule: "nvidia"
[    10.763] (WW) Warning, couldn't open module nvidia
[    10.763] (II) UnloadModule: "nvidia"
[    10.763] (II) Unloading nvidia
[    10.763] (EE) Failed to load module "nvidia" (module does not exist, 0)
[    10.763] (II) LoadModule: "mouse"
[    10.763] (II) Loading /usr/lib/xorg/modules/input/mouse_drv.so
[    10.763] (II) Module mouse: vendor="X.Org Foundation"
[    10.763]    compiled for 1.9.99.902, module version = 1.6.99
[    10.763]    Module class: X.Org XInput Driver
[    10.763]    ABI class: X.Org XInput driver, version 12.3
[    10.763] (II) LoadModule: "kbd"
[    10.763] (WW) Warning, couldn't open module kbd
[    10.763] (II) UnloadModule: "kbd"
[    10.763] (II) Unloading kbd
[    10.763] (EE) Failed to load module "kbd" (module does not exist, 0)
[    10.763] (EE) No drivers available.
[    10.763] 
Fatal server error:
[    10.763] no screens found
[    10.763] 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
[    10.763] Please also check the log file at "/var/log/Xorg.1.log" for additional information.
[    10.763] 

10x