Problem with network connection

Hi

Here's my setup. 1mbps ADSL (AOL UK) feeding into Dlink DSL504T/UK modem/router. Belkin F5D 6130 WAP.

2 computers running Win 2K3 server Enterprise. 1 desktop running Win XP home 1 laptop running Win XP pro

1 Win2K3 machine will not maintain a network connection. On booting it gets the connection, then after a few minutes the connection dies. I have tried this with a DLink wireless card, AMD chipset wireless card and a realtek wired network card. Always with the same result.

Does anyone have any idea what I'm doing wrong?

Don