My desktop disappears sometimes

Hello !
I have a recurrent problem on my MBPro 15" i7 w/ Mac OS X 10.7
Sometimes, my desktop disappears. I only can see a grey screen, the same grey as in the login window :
When the desktop has this bug, Mission Control also doesn't work. I only can see this same grey screen...
What can be the problem ?

reinstall lion,maybe it wasnt installed correctly
u shud install lion after formatting mac wid snow leopard n then install lion

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