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Failing that, the motherboard should be an Intel Bayfield board.
Drivers downloadable from here.
[URL]http://downloadfinder.intel.com/scripts-df-external/filter_results.aspx?strTypes=all&ProductID=948&OSFullName=Windows*+XP+Home+Edition&lang=eng&strOSs=45&submit=Go%21[/URL]
Get the INF drivers and install these first then the LAN drivers.
The graphics drivers you have (as you’ve replaced the card) or they can be found on the ATI or Nvidia site. The soundcard drivers are available on the SoundBlaster site.
The Modem and TV card (if fitted) can be a bit tricky but ask your brother for the disks first. If he still says he never got them post back and have a screwdriver ready.
If this computer is your only access to the Internet make sure you have all the right drivers saved to some media before you Format.
Hope this is of some help.