Mac OS X Lion install problems


i installing lion update through app store. when computer restarts lion installer says "install failed"
"mac os x lion couldn't installed, because disk macintosh hd damaged , can't repaired."
option gives me "click restart restart computer , try installing again"
have tried quitting installer , going startup disk wont let me reboot snow leopard.

please help!
 

same thing happened me, , when try repair disk tells me drive cannot repaired because cannot written too...anyone have insight on matter?

edit: when verifying disk gives me error "invalid node structure"
 


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