What drivers specifically? Virtio? For install I usually mount a 2nd CD drive with the virtio iso mounted and install the NetKVM and vioscsi drivers during the Windows install
Hmm I've never tried to install Windows 10 as a VM. What drivers specifically is it complaining about? If you're installing to a virtiodisk then you would need virtio drivers. If you're using virtio network card then you need the NetKVM.
You can just point whatever drivers are required directly to the CD and they will be automatically found. Did you check out the video?
Perhaps you need the latest drivers to work with Windows 10?