Any idea what Mac OS your using or what year/model MbPro you have? 10.6 or 10.7?
The Windows support files are installed while booted in Windows, they are Apple hardware drivers for Windows to use. Just insert the DVD, USB drive or whatever you have or made while in Windows and it should just start the install, if not then you can open the file and click on the setup.exe and do it manually.
When everything is working right there will be a Boot Camp control panel in WIndows to select the Mac OS to boot to when your done. On the Mac side there will be an option in the System Preferences/ Start up disk to select the Windows partition.
Press and hold the Option key after it reboots and it should take you to the boot screen with either OS icons showing.