acer n35 and tom tom 5

Hi have tom tom 5 on my acer and it works fine but when it is turned of it loses its home address and other details of last trip has anyone had same problem.

1. Make sure you haven't accidently locked your SD Card.

2. Look in your map folder for a .cfg file. (One .cfg file for each map you have installed). Copy and paste to a folder on your desktop and then right click on it, select properties and make sure it isn't set to read only. If it is, untick and copy and paste back to the map folder. If it asks 'Overwrite existing folder', say yes.