The message you are seeing is a generic one that Windows displays whenever there is a problem accessing a remote computer over the network. It is unhelpful and frequently inaccurate. Make sure that the remote computer's firewall is configured to allow access to other networked computers.
<<< I think it came about after I decided to move the My documents folder to another HDD,I have since restored it to the default location and performed a system restore >>>
Try "unsharing" the folder, reboot and then set it up as a network share again.