Migration Assitant - stuck transferring data from PC
I am trying to transfer all my user data from my laptop (running Vista) to my Mac Mini (running El Capitan), using Migration Assistant. I have tried several times, selecting different sets of daa to transfer. The transfer process, which identifies the laptop and starts the transfer easily, "hangs" towards the end of the transfer time (which for my music files is hours), and so does not complete. I have turned firewall off. Can anyone please suggest how this might be resolved before I have to resort to manual data transfer?
Mac mini, OS X El Capitan (10.11.2)