issue with moving quickbooks point of sale from old computer to new computer

My son works for this company where the old computer has died, so they purchased a new computer and are attempting to install and transfer the data from the old machine to the new one.  They have successfully installed quickbooks onto the new computer and since they do not have a current backup of the quickbooks data from the old computer and are not able to eccess quickbooks POS  on old computer we copied the data from the intuit folder of the old to the intuit folder to the new.  
Now, when they attempt to open qb pos on new computer it says that it cannot open because the company file is already open on another workstation.  
How do we resolve this issue?