Wireless Driver for Dell Studio 1558: openSUSE 11.3
Recently, I had to configure a brand new Dell Studio 1558 laptop of my cousin with W7 and openSUSE 11.3. Everything went smooth except for the wireless card driver . The problem behind its not working in W7 was that I installed the drivers from the driver CD which came along with the system not in the correct order. The Dell website gives a detailed description about the order in which drivers are to be installed. Once I followed that, Wi-Fi worked properly in W7.
Now I had to find a suitable driver for the card to work under SUSE Linux. The card was a Broadcom 43224. Here is the link from where I got the driver.
Broadcom Linux Driver
The README that comes along with the driver package has an elaborate explanation about driver installation and loading of the module into the kernel.