1394 LAN connection - no IP address

Hi . I just reinstalled windows XP home edition on to my Dell Dimension 8300 Desktop. The system was grinding to a halt. but its great now apart from the fact I can no longer connect to the internet. I have a Virgin Cable Broadband connection which works fine on my laptop (with Belkin wireless in the middle).

When I look at the 1394 LAN connection it shows no IP address. When I try to repair it, it comes back with 'Failed to query TCP/IP settings of the connection. Cannot proceed'.

Any help would be greatly appreciated