Windows 7 won't boot

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http://askubuntu.com – I installed Ubuntu from my live CD and chose to install it alongside Windows. Yesterday, everything worked just fine and I was able to boot from either OS. However today, only Ubuntu will boot and Windows 7 fails to start every time I attempt to (even after restoring my Windows 7 partition to the last known good date). What could have changed over night that caused this? I did install all the recommended updates for Ubuntu. Is my only option going to be to wipe my HDD and reinstall both Windows and Ubuntu? (HowTos)