Recently I was setting up Boot Camp on my old white Macbook.  I decided to use a fresh copy of Windows 7 Home Premium SP1 64-bit.

The install went fine and as Apple suggested, I copied over the windows support files. Awesome. I opened the folder and selected the setup file, and was immediately given the message:
“Boot Camp x64 is unsupported on this computer model”

This had to be a mistake. This model clearly supports 64-Bit. It’s a core 2 duo processor… and I already installed the operating system.

So I did a little digging, and ended up in “Drivers\Apple” looking at a file called BootCamp64.msi. I double clicked it, and was prompted that I needed elevated permissions to continue, and should run setup.exe. This is great advice had I not already tried that. I did find a solution to this problem.

1. Copy the “WindowsSupport” folder directly to the “c:\” drive.

2. Select Start and in the Run box type “cmd” on the “cmd.exe” icon that show up, right click and select “Run as Administrator”

3. In the run box type “cd C:\WindowsSupport\Drivers\Apple” and hit enter.

4. Type “BootCamp64.msi”

From here the installer will launch, and you MAC will now support 64-Bit drivers.

Follow the prompts and reboot as necessary.

TLDR:

Run command prompt as administrator. Browse to /Drivers/Apple folder. Run BootCamp.msi

If I helped you out consider buying me a beer