Boot camp lost after upgrading to Yosemite from mountain lion

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I lost my windows7 boot camp after I upgrade to Yosemite from mountain lion. When I press ALT when rebooting there is no more alternative to boot for window anymore. I did read some thread about this but my case is different since when I tried to type 3 steps(diskutil.......etc) 😕 as LonerT user answers it did not work. The attached files here are what I faced with. Please help. I have a lot of important files in windows

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MacBook Pro, OS X Yosemite (10.10), macbook pro

Posted on Nov 10, 2014 1:38 PM

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Boot camp lost after upgrading to Yosemite from mountain lion

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