Mac OS X gone after restart

So i started having problems this morning when my flash plugin kept quitting unexpectedly in safari, and system preferences kept quitting unexpectedly also. I looked online for help then used disk utility to repair permissions like someone had suggested. After this i reinstalled safari then restarted like normal, but now my Mac OS is no longer there when i boot and hold down option, only a windows partition that does not work. I know i did not delete my OS X partition, is there any way to get back to it or am i screwed here?

 

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So I finally got my SL disk and when it starts all I see is my windows partition even disk utility is showing only one. Im thinking somehow it got erased? Is there anything I can do here i don't have anything except music backed up?

 

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Nvm I took it to the apple store they had no explanation but my hard drive somehow reformatted itself... I lost everything and am in the process of reinstalling snow leopard thanks anyway