"the system is running in low-graphics mode"

sachinmm

hello everyone i m newer in linux i am using ubuntu 12.04 32 bit

when i start my pc and login to my user it shows following window ==>

"the system is running in low-graphics mode" ==>

your screen,graphics card and input device setting could not be detected

correctly.you will need to configure these yourself.

in my pc there are 2 os first windows 7 and second ubuntu 12.04..my windows

is properly running but when i login to ubuntu it shows above message i

cant access to

it cant be fix....