Grub Doesn't Load after Update
Solution 1:
Here is the bug report. You might try the solution offered by comment 90
All you need to do is download the file attached to the comment and replace your current C:\wubildr with it.
Also, of note from post 91:
Please make sure that when you boot the line "insmod ntfs" is commented out or disable it by pressing "e" at the grub boot menu and edit the entry before proceeding.