How do I change the file path for all the textures used? I have made a scene in blender following some tutorials, however, since my C drive was getting too loaded, I shifted all my Blender stuff to the D drive. Now when I make a render in blender, all objects have a Purple colour to them. Reading other questions, I figured that it might be because the source of all the image textures have been shifted from C to D drive. 

I changed the source of my textures on the current model I am working on through the node editor, however, for all my other .blend files, do I have to correct each textures location file one by one or is there an easier way?
File -> External Data -> Find missing files -> Choose your texture folder -> Find missing files.

Blender will then replace all missing textures with the fitting ones from the new selected folder.