Have you been thru the manual?
Boot_Camp_Install-Setup.pdf (application/pdf Object)
Step 3: Install the Boot Camp Drivers for Windows
After installing Windows, install Mac-specific drivers and other software for
Windows using your Mac OS X Leopard installation disc.
To install the Boot Camp drivers:
1. Eject the Windows installation disc.
a. Go to My Computer.
b. Select the optical drive (D)
Click “Eject this disk” in the System Tasks list.
2. Insert the Mac OS X disc.
The installer should start automatically. If you have AutoRun turned off, double-click
the setup.exe file to start installing the drivers.
3. Follow the onscreen instructions.
If a message appears that says the software you are installing has not passed Windows
Logo testing, click Continue Anyway.
Windows that appear only briefly during the installation don’t require your input.
If nothing appears to be happening, there may be a hidden window that you must
respond to. Check the taskbar and look behind open windows.
4. After your computer restarts, follow the instructions in the Found New Hardware Wizard to update your software drivers (Windows XP only).
Boot Camp 2.0, Mac OS X 10.5: Frequently asked questions