If you are on lan internet like hotwire or sify and the local cable guy uses hubs, then DU meter is useless, it doesnt indicate the correct speed. Even with zero data transfer and no internet applications running it shows a constant download speed of 4-5 Kbps ie the data packets hitting your lan card which are not meant for u are recorded by the program as data from internet.
Use BW meter from www.desksoft.com where you can specify the local area network ip addresses and thus differentiate between Lan traffic and internet traffic.