Well it sounds like your MBR is OK as its making to the lovely OS loading bar, so I would try booting into safemode and having a look.
Was there any updates installed before that last 'turn off' as they could be the root reason why it did not reboot.
If you don't want to spend to much time farting about with it you can just install windows over the top. You'll look most of your setting, but along as you pick the install path it will leave all the data alone.
Hope you back up though.
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