I have tested several times and yes, this is one of the weird problems I have faced. If I have my vodem plugged into my Macbook USB , my macbook doesn't boot into Windows partition at all. If I do forcefull shutdown, remove the vodem and restart, it then boots into Windows without any problem!
My Macbook is the current one with 2.4 Ghz
Anybody have any idea whats going on?