Spyware???

i’m havin dialup connection to internet.
Whenever i connect to internet, the calligraph shows there is always around 70kbps data being SENT even if i don’t browse anything)just connected to internet). i tried spybot and someother anti-spywares and RegistryMechanic. Moreover i usually delete all private datas as soon as my browser is closed. all of them are of no use. still the problems is there. pls help me.