black screen after installing nvidia driver 64 bit ubuntu 11.04

[NaveenX]

I have an aspire laptop with GeForce Go 7600 card.
I install the current recommended nvidia drivers using the Synaptics package manager.
Using the NVIDIA XServer Settings Tool. I receive the following message

You do not appear to using the NVIDIA X driver. 
Please edit your X configuration file (just run 'nvidia-xconfig' as root),
 and restart the X server.

which I do and then reboot, which results in a black screen.

I appreciate any help you can give in resolving this. Thank you.

I include the xorg.conf file

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 270.41.06  (buildmeister@swio-display-x86-rhel47-08.nvidia.com)  Mon Apr 18 15:14:00 PDT 2011

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

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# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 270.41.06  (buildmeister@swio-display-x86-rhel47-08.nvidia.com)  Mon Apr 18 15:14:00 PDT 2011

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

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"
EndSection

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

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

and I also noticed this in the kernel log

nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
NVRM: This PCI I/O region assigned to your NVIDIA device is invalid:
NVRM: BAR1 is 0M @ 0x0 (PCI:0000:01:00.0)
NVRM: The system BIOS may have misconfigured your GPU.
nvidia: probe of 0000:01:00.0 failed with error -1
NVRM: The NVIDIA probe routine failed for 1 device(s).
NVRM: None of the NVIDIA graphics adapters were initialized!
vesafb: cannot reserve video memory at 0xb0000000
vesafb: abort, cannot ioremap video memory 0x500000 @ 0xb0000000
Trying to free nonexistent resource <00000000b0000000-00000000b04fffff>
vesafb: probe of vesafb.0 failed with error -5