On my old 5 year-old IBM A31 Loading your Vista Wireless driver:
1. You won’t be able install your Vista drive. So, in Windows 7 you get a “can’t find driver” message for your unknown network device (“under Device Manager”). In this case I was trying to install you PCMCIA Wireless network card.
2. Look for your Wireless card CD disk and put it in your CD drive.
3. Then, select "Locate and install a driver manually" from the "Update Driver" button from the Driver Properties in Device Manager.
4. Look for the Vista 32 (or 64) driver folder and pick the driver name to start loading.
5. If everything goes well, then the driver should work and enable you to connect to your home wireless router.
This steps helped me re-install my Belkin Wireless G Notebook Card in Windows 7 Beta 1 OS.
Hope this helps.