That seemed to work, (but I had to download Vista driver, as there is no W7 driver) and device manager, under network adapters, now shows "Fujitsu Siemens Computers WLAN 802.11b/g(SiS163u)".
When I click on this the normal box opens up, which under the "general" tab tells me that "the device is working properly".
However, when I try to connect to my BT homehub (which this machine used to connect to perfectly before I upgraded to W7) it can see the network (and shows its proper name of BTHomeHub2-xxxx) but fails to connect.
Can I be certain, from the apparently successful instal, that I really have a D2301? FJ were unable to tell me, from the machine serial number, if I had this or an Intel 3945ABG.