Strange Message After Image Restore

I installed a new HD in my wife's laptop and restored and image with ShadowProtect. The restore went fine but after re-booting I got the following message: "The system partition has different symbol from saved one. Please reinstall to fix it issue." Weird message and wording. A quick google turned up a vague reference to Returnil as a possible cause so I uninstalled Returnil (free version) and the message is now gone. Can anyone enlighten me on what this message means and how it relates to Returnil?

 

The message is due to the change in your HDD line up. All you need to do when this occurs is to uninstall and then Reinstall RVS. We are working towards a more robust method in the future that will allow on-the-fly changes like this without need for a reinstall.

HTH
Mike