Windows Deployment Services can't see Virtual Machine Volumes, Driver issue?

Hello

I am setting up Windows Deployment Services on Windows Sever 2008 R2 which is working fine, I have created a VM that connects to the Windows Deployment Server, once connected it uses a boot.wim file start the process of capturing an image of the VM to be able to deploy to multiple machines. 

Once I have booted into the boot.wim it starts the capture an image wizard but I can't select any volumes, i think this is because of a driver.

Now I know I have to install the driver into the boot.wim file using the dism command, but I'm unsure of which driver I need, is it a windows driver or a vmware fusion driver???

Im using Vmware Fusion 5

Thanks in advance

Matt