If a Mac feature still doesn't work after updating the Windows support software, search for your symptom on the Apple support website or Microsoft support website.
BROADCOM DRIVER FOR WINDOWS XP ON MACBOOK INSTALL
BROADCOM DRIVER FOR WINDOWS XP ON MACBOOK UPDATE
If your Mac has an AMD video card and is having graphics issues in Windows, you might need to update your AMD graphics drivers instead.
Boot Camp requires a Mac with an Intel processor.