MacBook updated to OS X Yosemite version 10.10 and experiencing problems with hard drive & iPhoto
Unsigned kexts are no longer allowed to run by default in Yosemite.

Solutions include...  


upgrade to one of the [paid] NTFS apps that still work - Tuxera or Paragon
Requires you to fully uninstall NTFS-3G first   
disable the Mac's kext policy - easiest way might be to install TRIM Enabler, which will do it for you [though I don't know if it would install with no SSD present, never tested] 
or the long way - [this is untested, method from cindori, the makers of TRIM Enabler - it might only be for that app]
Boot your Mac in Recovery Mode by holding  ⌘ Cmd   R   during boot
Open the Terminal from the menu bar
Run these commands, replacing YourDisk with the name of your Mac disk  


rm -rf /Volumes/YourDisk/System/Library/Extensions/IOAHCIFamily.kext  
cp -r /System/Library/Extensions/IOAHCIFamily.kext /Volumes/YourDisk/System/Library/Extensions/IOAHCIFamily.kext  
touch /Volumes/YourDisk/System/Library/Extensions  
kextcache -u /Volumes/YourDisk  


Wait until it finishes (can take up to 1 min)