Windows 7 on Mac OSX

Delete the partition and reinstall Windows 7. Did you try to install 3rd party drivers?

 

It's anyone's guess. Typically Windows Updates do not do that - that is usually caused by a dirty shutdown corrupting the disk. You can try booting from the Windows 7 media and running repair utilities from that, or saving your files by dragging them in OS X to the OS X partition and reinstalling Windows.

 

After installing BC with windows 7/8 and BEFORE (NEVER-AUTO) update your CLEAN install:

1. make a repair-point [good english? ] With those you can always, after three faulty boots, repair last known best install;
2. make a backup to an external backup of the clean install;
3. turn AUTO-UPDATE-and-install [OFFFFFFFF!!!] in your Windows and assure yourself that i.e. NO old display-driver will be installed in your working fresh install:
4. choose your updates carefully, if not certain check forums for users experiences and always make an all-systems-go repair-ponit BEFORE each mayor update for Windows or hardware drivers!

Just my 2c! Good Luck & Cheers!!!

 

Reinstall it