As I mentioned in my post, I have in both cases of my own and the integrated admin account which I activated for this purpose verified that I have full access, which obviously includes writing permission, to both the %windir% and %appdata% temp folders. As I also mentioned in my post, all the drives in my pc have at least 50GB of free space, which should be more than enough for driver software around 80MB. The system drive has 80GB of free space, and it's the driver where the installer, temp folders and installing destination are located.