Windows 7 no longer boots after upgrade from Lion to Mountain Lion

I got a late 2011 MacBook Pro, on which I installed Windows 7 with Boot Camp. After I upgraded from Lion to Mountain Lion, I can no longer boot Windows. If I keep the option button pressed during boot I only get the OS X and recovery options, and if I choose to boot Windows from the system preferences pane, I get a message that says that no bootable device was found. However, I'm sure that the partition is still there, because I can see it in finder and browse the files normally. How can I boot Windows again?

"Easier" in this case as an alternative is defined as repartitioning/reformatting your disk, and restoring from backups (which for most people also means starting from scratch with Boot Camp Assistant and Windows since most users aren't backing that environment up).
What you did is, in my opinion, easier and faster. But if you don't know what you're doing can lead to data loss. But then, by definition, blowing away your disk and starting over with a restored backup begins with data loss!

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