Hyper-V and RIS

[Zoom7000]

I've created a virtual machine in Hyper-V and I'm trying to build the OS using our RIS images. However, I keep getting the error from RIS saying that my image doesn't have the correct drivers for my network adapter.

I'm using the Legacy Network Adapter as you have to use this to install using a RIS image.

I've found the driver I need, it's called dc21x4vm.inf/sys, I copied it from Window\System32\DriverStore\FileRepository however, it's now complaining the file is corrupt! Argh! Can someone please tell me where I can download this driver?