You would have to ensure that the drive letter of your laptop's hard drive is the same as the drive letter of the external hard drive you originally set things up on. I'm sure you can do this, but you'd need to check exactly how. It might be as simple as the way I described earlier, or you might need to do it through the BIOS settings on your laptop.

The principle is the same - OCD will be looking for the drive letter to be the same if it is to play stuff!