Ubuntu 12.04 not Stable / Lagging, Freezing.

Can you give the output of:

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

Thanks

Also, have you tried the Unity2D session which is selectable from the login menu.

Yes, I tried Unity2D But same problem.

And the output of the command please. Thanks

What you recommend i want Dualboot should i do the automatich dual boot thing from Ubuntu or install with disk

thom@ubuntu:~$ sudo lshw -C display; lsb_release -a; uname -a; dpkg -l | grep nvidia
  *-display
       description: VGA compatible controller
       product: GF106 [GeForce GTS 450]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nouveau latency=0
       resources: irq:19 memory:fa000000-faffffff memory:f0000000-f7ffffff memory:ec000000-edffffff ioport:ec00(size=128) memory:f9f80000-f9ffffff
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise
Linux ubuntu 3.2.0-23-generic #36-Ubuntu SMP Tue Apr 10 20:39:51 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
ii nvidia-common 1:0.2.44 Find obsolete NVIDIA drivers
ii nvidia-current 295.40-0ubuntu1 NVIDIA binary Xorg driver, kernel module and VDPAU library
ii nvidia-settings 295.33-0ubuntu1 Tool of configuring the NVIDIA graphics driver

You are still using the opensource drive despite having the proprietary driver installed. Sounds like a junky screen. Try:

sudo nvidia-xconfig

and reboot

Now is my screen very resulution very low..
HOw can i fix this all things are really fat now.

run:

gksudo nvidia-settings

and set the res then click 'save to X config file'