Hi I have a 1450 LMT, I found it no longer shows FM traffic so I want to reinstall everything, but so far I have tried actions below, but it still cant connect to PC

install communicator plugin
install GPS USB driver
connect to PC during preboot mode
see nothing in my computer's device manager/disk management

PS: I've tried above methods in win7 64 and win XP

So now I really dont know what I can do...

any suggestions?