There are three ways to install new hardware.
1. Depend on the OS to recognize it and ask for the drivers.
2. Install the drivers yourself via Config Panel>Hardware and force the install without Windows having detected the new hardware.
3. Run the install program from the CD (or the downloaded setup).
With method 2 and 3 the device is only recognised after you installed the driver. So "not detected ... so not installed" isn't applicable then.
Not clear which of those you tried.
On my Asus F5R notebook PC Wizard 2007 shows in its System Summary the Network Card "Broadcom Corp Dell Wireless 1390 WLAN Mini-PCI Card" HOWEVER having left VISTA and gone back to XP the card is not detected by XP and thus the driver is not installed. I've tried the latest updates from Asus without any success and other drivers for the same card but no luck. Running out of options. Anybody know how to get the wireless detected and running?