Like Vancouv I've just upgraded to Livebox and I'm running XP also.
After some problems with the installation CD its working now but I'm finding that I get poor/limited connectivity sometimes due to the network not assigning an IP address..
If use XP's "repair" facility on the network connections that seems to cure it..
Range is modest - low to very low signal at 30 feet (and two brick walls inbetween) but other than video sites e.g. youtube where it sometimes stutters, on other sites, like this, works ok.
The other day I shut down the laptop: restarted a few hours later and found I was still connected wireless wise to the livebox. Am I better disconnecting when closing down? or doesn't it matter? I'm leaving the livebox on all the time.