juki wrote:
thank you very much guys...now another problem occurred when i want to update my previous MapSource v6.15 to v6.163..updating was successful but it failed when installing the new version, it stated that 'previous MapSource cannot found...setup will terminate'. Pls help

Are you installing in Network environment? Are you in Administrator mode?
I have the same problem when I tried to update the Antique mapsource in my new work place but old computer. The OS was Windows XP SP2.
After getting the IT officer to grant me Administrator to my networked computer and having upgraded SP2 to SP3 (took 6 hours to download the 500+MB SP3 patch, Mapsource now runs beautifully.