just about at the point where it all goes in the bin. trying to upgrade the map on my start25 it managed to trash the current map and wont complete the load of a new one. i've tried added a memory card to it, turned of virus scanned (why is this needed) and it still will not complete. had the same last time , took 20 + goes, there has to be a better way. Any possible help /support before its trash?