Such a shadowing message will normally occur if one of your partitions doesn't have enough space to create the shadow copy. It many cases it turns out to be one of the small partitions like the System Reserved or small Recovery Tools partition.
You might attach a picture of your Disk Management picture but repairing such a problem used to require modifications to your partitions by a third party partition management software, which can be dangerous. But using a third party imaging software may allow you to get an image without having to change anything.