How to retrieve the vhd file of my VM

Hi,

My Project Server 2010 VM (for demo, on my laptop) is corrupted so I want to replace it by a copy I made several months ago on an external HDD.

The "Import Virtual Machine" feature generates the error message : "A server error occured while attempting to import the virtual machine. Import failed. Unable to find virtual machine import files under location..."

Is there another way to use/copy/retreive  the .vhd file as a VM on my laptop?

Thanks for your help

NB : OS = Windows Server 2008 R2 +SP1