$info = Mount-DiskImage -ImagePath "\\SynCloud\Data\Resources\virtio-win-0.1.262.iso"
$Drive = ($info | get-volume)
$Source = $Drive.DriveLetter+":\guest-agent\qemu-ga-x86_64.msi"

msiexec.exe /i $Source /qn

Dismount-DiskImage -ImagePath "\\SynCloud\Data\Resources\virtio-win-0.1.262.iso"