Windows 7 partition has stopped booting. Help?

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My partition for windows 7 does show up when I go to the partition menu by holding the alt (default being the options key I think.) However it is not gone and I can browse all the files within it, and copy them, to my OSX partition. However as shown above, disk utility does no recognise that my partition has any folders or files. Although upon verifying you can see that it is browsing x number of folders, and it recognises that 674Gb is used in the form of x number of files. I have not at all altered my partition's size, my windows partition remains at 1.44 Tb. However there appears to be two OSX partitions present on my system, although i'm not sure if that is normal or whether it was created by my brother when he first set up the partitions. This all started about a week ago, i'm not sure why, it is possible that somone in my house updated OSX without me knowing however it is impossible for me to tell as I cannot remeber the previous version I was running and I don't know how to find out when the last update was. I am currently running Yosemite 10.10.3. Any help would be much appreciated, especially if it doesn't involve me deleting and reinstalling the whole partition! Thankyou:)