When I purchased my ASUS G750 two years ago my main objective was to get a laptop to run my studio and replace my old XP machine. My existing ASIO audio interface connected via Firewire but no PCs were providing IEEE1394 Firewire ports.
Have you also checked if you have the latest driver installed on the computer? If so, you may run the Program Compatibility Troubleshooter and change compatibility.
So after some research I found that Thunderbolt would provide Firewire through an adapter by Apple so I bought the ASUS preloaded with Windows 8.1 and a Thunderbolt to Firewire adapter. All was fine and I've been recording music for two wyears. Aoc E2251fwu Driver Windows 10. A couple of months ago I thought I would try to upgrade to Windows 10. It went very well and my studio was still functioning. a few weeks ago my interface stopped working and I noticed that Windows Update k3140741 was installed. I contacted support and they told me to uninstall the update. It wouldn't uninstall, so they told me to restore to the poit before the update, It did and automatically installed the update. I contacted support a second time and they had me rerun the Windows 10 (which I didn't know at the time was going to prevent me from going back to my Windows 8.1 version) and that didn't fix the issue. So I contacted support again and after 4 hours they told me Windows is no longer going to support the Firewire adapter because it is obsolete.
Apple still sells the Thunderbolt Firewire adapter and is supported on Mac, so it is not obsolete. I want to know why Windows will no longer provide an IEEE1394 driver for this device. My friend has a laptop just like mine with Windows 8.1 and when I plug the Thunderbolt Firewire adapter in and a IEEE1394 device shows up in Device Manager. But on my machine when I plug it in it shows up as a thunderbolt controller under system devices. I wish the Windows Team would put support back for my adapter.