Macbook Pro hangs when booting into Boot Camp Windows 7

I have a 2011 Macbook Pro 15" 10.7.4 with Windows 7 installed in Boot Camp. A few days ago, I tried to boot into Windows 7 and it just froze after I selected the Boot Camp volume on the Select Drive screen and the processor fan went into overdrive. This now happens every time. The only way to make it functional is to force-power-off and restart in OS X.

I don't understand what's happening - Windows 7 works fine when I use it via Parallels, but won't boot to the metal.

I've tried resetting the SMC and PRAM but nothing seems to work. This is extra frustrating because I need to use Windows for work.

I looked here, but it's no help:

Bootloader freezes on login screen when booting into Lion from Boot Camp

Solution 1:

If you get a copy of Paragon NTFS for Mac you can do a disk repair for NTFS volumes. The software has a 10 day trial and a license is about $20. NTFS for Mac also serves as a driver for full access to NTFS volumes which is superior to the limited Read only access of NTFS volumes built into Macs. If you are a regular user of both Mac and Windows its worth the investment.

Once installed the program is accessible from System Preferences. For the problem described above you need to first unmount the volumes "System Reserve" and "BootCamp". Then remount the volumes and run verify on each volume.