dawn s

I have a Gateway laptop and it came with Windows Vista on it, I had to reinstall it because of an issue with the laptop. I used the disk that came with it and reinstalled everything but now the wireless is not working. It worked before but now it seems the disk did not reinstall the driver I need. Anyone know where I can download this? I went to Microsoft and it downloaded 75 updates none of which fixed the wireless issue.
Any help is appreciated - Thanks!