Gave game cannot find DB

How can I get round the message that appears when you copy a save game onto another computer and then try to load it. I used the default database and started a game, I then copied the whole of the db folder and the save game to another computer but I get a message saying the database could not be found so it will load the default database. However, fm then closes but it is still in the running processes so you have to go into the Task Manager to close it.

How can I get it back up and play with the default database?

Thanks