Have to repair local area connection after reboot

Hi

My PC is running XP home and is connected to a US Robotics SureConnect
broadband DSL modem / router.

When I first switch on or reboot the PC, the internet connection doesn't
show in Network Connections until I right-click the local area connection
and click Repair. I get a message that says the repair operation succedeed,
and that if problems persist I should contact my ISP.

Now I doubt this is an ISP problem as the router is showing that it is
connected, I suspect some sort of networking problem, but I don't know what.
Can anyone help?

Thanks.

CJ