Broadcom does not build PCI network cards, they are a chipset maker. It's impossible to help this kind of request because of important info that's missing from your request:
1: Did this device come pre-installed in your computer or did you purchase it separately then add it to the pc?
2: Used in a desktop or laptop computer?
3: Motherboard/Computer brand and model?
4: Are you certain the interface is PCI or could it actually be integrated on the motherboard or a small mini PCI card made for notebook computers?
5: Did it come from the factory with Windows Vista installed?
6: What is the hardware id string? (found in Device Manager by double-clicking this device, click the Details tab, select "hardware id", then give me the 1st line of text that begins with 'PCI\VEN' (eg: the hardware id string). Type it carefully into Notepad then copy and paste the string into another post in this same thread. Double check all digits to insure they match what was displayed in Device Manager (prior to clicking the Submit button.)
Or you can click the HOME button (upper left of this page) then download and launch the new beta DriverScan 2011 program that will automatically provide an up-to-date driver link for your machines hardware. However, if it's used in a notebook computer, you must
visit the website of the company who made your notebook (for support). Notebooks cannot use Generic drivers, they must use specific drivers from the notebook maker.
Or you can use the SEARCH box/window on that same page to search for drivers matching your hardware (posted in our driver database) using the Simple Search Wizard. There's lots of ways to obtain working drivers if you apply a bit of common sense.