Thanks for the reply,
I did manage to get the GPS going again by renaming the global_cfg folder and file and after some mucking around it came good. I managed to change maps as well.
I did some work today on my other vehicle and I did nothing to the gps, but it came up with the global_cfg not found error as well. Only thing that seemed to work was removing the sd card and starting the program then re-inserting it and the Nextgen started up fine.
I was not sure if asking multiple unrelated questions in the same thread was a good idea. I will do that in the future. I will try Total commander as well as the standard one is not that great.
I appreciate the help.