

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.
INSTALLING WINDOWS ON MAC PRO 2009 INSTALL
There is Windows 8 installed, but I would like to install the OSX again. When the download completes, quit Boot Camp Assistant. From the menu bar at the top of your screen, choose Action > Download Windows Support Software, then choose your USB flash drive as the save destination. Open Boot Camp Assistant, which is in the Utilities folder of your Applications folder. In Disk Utility, create single a free space partition on the Windows 8.1 drive. Make sure that your Mac is connected to the Internet.

When you install Microsoft Windows on your Mac, Boot Camp Assistant automatically opens the Boot Camp installer, which installs the latest Windows support software (drivers). I just bought a used Macbook Pro 17 inch form early 2009. Steps to install Windows w/ Bootcamp Drivers: 1) (Note: I’ve replaced my superdrive with a separate drive for Windows 8.1, and Mavericks is on it’s own SSD). Boot Camp requires a Mac with an Intel processor.
