windows 10 - Identifying software affecting download speed

I am trying to troubleshoot a family members PC that is getting a very poor download speed compared to all other computer on the network.

All other computers get around 23Mb/s down 4Mb/s up. But this computer is getting a >0.1Mb/s down and 4Mb/s up.

I initially thought this was a wifi issue however when accessing files on a local NAS I get 35MB/s up and down.

Troubleshooting further I found I do not have the issue when using a wired connection but do have the issue when using a variety of different USB wifi dongles with different chipsets (or the inbuilt PCI adapters)

I have also tested the connection from Ubuntu which did not have any issues so I believe I can rule out hardware

I have removed the drivers and reinstalled the latest version, with no effect.

All this leads me to believe it is an issue with some software affecting only internet downloads. Looking around a number of people seem to have had issues with AMD quick stream/sync but this is not installed on this machine.

How can I go about troubleshooting what software is causing me trouble, noting I was not able to test in safe mode as the drivers for the card do not get loaded.

EDIT: Added Part Details

Operating system: Windows 10

Motherboard: Gigabyte B150M-HD3

Processor: I5-6500

PCI Wifi Card: ASUS PCE-AC56, using driver Asus 7.35.317.0 dated 19/09/2015

USB Wifi Adapter (with same issue): Netgear WNDA3100v2 driver version Netgear 5.100.68.29 dated 13/10/2010

Router: ASUS DSL-AC68U

I have now tested in safe mode, with the same issue still occuring, and have run the sfc scan with no errors found.

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