Messed internet connection after install firewire

Hi need help here.
Just installed a firewire card on my mate's pc. Installation went smoothly, firewire and ipod are working, but the internet connection has stopped working? :confused:
No conflicts whatsoever.. how to solve this mistery?
many thanks

Checked under internet connections? Adding a firewire card will add a network interface - IE may be trying to use that instead of the normal one.