Problem with wireless SpeedTouch 570

On the SpeedTouch i have wireless a desktop and a Laptop. Connection is via
a USB Dongle.
The desktop gives no problem.
When a closed the laptop and new started, the laptop fond the SpeedTouch,
gives a good signal, but i can not contact with the www.
I had push the button on the backside of the modem for renew the connection
with the www.
The laptop has Windows XP.
Can someboby my give advice?/
Thanks
Jan van Dijk. Holland
(E-Mail Removed)