nvidia drivers problem

Can you give the output of:

sudo lshw -C display; lsb_release -a; dpkg -l | grep nvidia

The CPU model is of zero value, we only need the display information.

 *-display UNCLAIMED
       description: VGA compatible controller
       product: nVidia Corporation
       vendor: nVidia Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller cap_list
       configuration: latency=0
       resources: memory:f0000000-f0ffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:3000(size=128)
  *-display
       description: VGA compatible controller
       product: 2nd Generation Core Processor Family Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:43 memory:f1000000-f13fffff memory:e0000000-efffffff ioport:4000(size=64)
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.04
Release: 11.04
Codename: natty
ii nvidia-common 0.2.30 Find obsolete NVIDIA drivers

This is a problem with the Nvida install for 32bit systems. Try Ctrl-Alt-F2 and login. Some outputs you need to provide is:

dkrm status

...and...

your output from doing 'startx'.

In this you should find that 173 and 230 are BOTH LOADED, but it cannot find the 173 libraries. In the Startx output is the path to the library. The link points to the old 173 location. You will find in /usr/lib/x*linux-gnu/xorg is a directry called extra-modules. It is pointing to the 173 library and not the 230 which is presently loaded. Which is why you get the errors on the output. You have to link it to right extra_modules directory in /etc/alternatives.

Make sure you 'dkrm nvidia-173 --all'.
Reboot

and if you have 230 loaded, it should run well. If not, then:
(login via console, Ctrl-Alt-F2)
sudo apt-get purge nivida-current
sudo apt-get install nvidia-current
reboot

Hopefully this should work....