How can I install drivers for bootcamp without using the mac install dvd?

I installed windows 7 in bootcamp on my mac. I put the drivers on a FAT format usb stick so they should be installed while the windows installation was running. The most things are working on windows like the i-sight-camera. The problem is that the microphone doesn´t work so I look for a solution for 3 days, no result. Normally, you use the mac install dvd to install the necessary drivers but windows doesn´t want to read the dvd. And yes, you can download the drivers on the apple platform, but that doesn´t help me at all.

Thanks in advance. (sorry for the language)

iBasti94