You say that you don't have control over the AV and Firewire settings, does this mean that the PC you are using is connected to a company Network?
If this is the case then I would ask the Network Admin. to have a look at the problem.
Gerry
System: Win 10 Pro (21H2), Asus X99-E WS, CPU i7-5930K -3,5 GHz, 32 GB DDR4 2666-16 RAM, NVidia GTX 1080 Ti GPU - 11 GB VRAM(Driver Studio-536.99), Samsung 850 Pro 512 GB SSD, 6 TB HD storage.