ah, in that case, sorry, i don't think you can safely move the image files, because windows may not be able to find them again if needed.
i would recommend using a third-party imaging solution such as the free
macrium reflect - it's got a few more options, and allows you to save image files wherever you like, even on your network (if you have one).
...or make a new system image, and make sure you have another drive connected (either internal or external) while you are doing it, and save the image there.