Q: Windows 7 dosent recognize bootcamp or any devices after it was installed

After instalingl win7 os, it doesn't automatically install the drivers for windows. I've done this many times, on reinstalling my win7 on my macbook pro and this is the first time I encounter this problem. I used an external drive for the bootcamp support driver and it has another folder, is this the reason why bootcamp support driver doesn't install auto or another reason? because if it doesn't install bootcamp support driver for win7 it cannot recognize bootcamp or any devices like usb's, external optical drive etc. Pls help, thank you...