I purchased a map for a different country. I unloaded the USA/Canada maps using the TomTomHome software. I cannot load new map because the device still shows all the space as occupied. When you power the device it shows no maps, when you look at what is installed, the total space that should be used is about 100mb. I looked at the drive on my computer and it also shows all the space used, however, the sum of all the files is also about 100mb. Any suggestions?