desktop become ass color

[Mithun Zakir]

I got a new problem in ubuntu. After some minute my desktop become ass color and it stays  2-4 second. Its so much boring and 
that time i cant do any work means machine do not allow any key or click.

 
I haven't faced this kind of problem before updating ubuntu ibex. 
i am currently using intrepid ibex on hp 520 laptop. I'm using two os (windows Xp).

I was trying to fix this problem by this command : sudo apt-get install --fix-missing.
But I didnt got any result.

Oh yes my  Screen saver is turn off.
Oh god !  i don't know how can i recover from here.
plz help me .




      
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