"Unmountable_Boot_Volume"

I was using my Toshiba Satellite today and I went away to run a few errands. I left the computer on and music playing. I came back to try to use it and found that the computer said a problem was detected and an option came up to launch repairs. When I click on it the windows bar loads and then the screen turns black and the computer fan shuts off. It wont start in safe mode as it does the same thing. I don't have the windows 7 installation disk. I can't access bios and the computer is about 6 months old. The computer has been working fine and I haven't made any recent hardware changes and havent installed any recent programs. Any tips would be greatly appreciated. Thanks.

Technical information:
*** STOP:0x000000ED (0x85BD2770, 0xC0000185, 0x00000000)
 
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