Windows 10: Speed stuck at 100Mbps on 1Gb Fibre

So I have been trying to fix this for the last week....- I have had 1Gb Fibre installed.- I installed a TP-Link 2.5 Gigabit PCI Express Network Adapter TX201 .Issue-The speed on my Ethernet is showing 100.0Mbps.-Changed Speed and Duplex to 1.0Gbps Full Duplex.-Speed on Ethernet does NOT change from 100Mbps. But stays at 1.0Gb within the Duplex settingsSo even though it is set on Speed and Duplex to 1Gbps at the Ethernet Status the Speed is staying at 100Mbps.LayoutRouter -> Cat8 Cable -> 2.5Gb Network Adapter.I have tried 5 Different Cat8 Cables, I have tested the cables, it is NOT

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Windows 10 download speed locked at 100Mbps

I recently re-installed Windows on my computer, and now under the network tab in Settings, it shows that my internet speed is locked at 100Mbps. I have gigabit ethernet installed, and before re-installing was able to get full speed on my internet. I have tried changing the Speed/Duplex settings in the Network Adapter options in Device Manager, setting it to full 1Gbps Duplex, but this has not changed the settings at all, and my speed is still locked at 100Mbps. This isn't a problem with my router, as other devices on the network, both wired and wireless, are able to get full speeds. I also reset the network settings in Settings, but that didn't help either.

 

Link speed say 100mbps, when it should be saying 1000mbps/1gbps

A few weeks back i got Fiber internet put in. We are paying our ISP for 200mbps. One computer is only getting 50mbps and the link speed in task manager says 100mbps. unlike another PC in my house reading a link speed of 1gbps and is g etting the full 200mbps.

I have tried changing the Speed and Duplex to 1gpbs but the link speed still says 100mbps in task manager. I am still not getting the full 200mbps. I have been testing my speeds with Speedtest by Ookla - The Global Broadband Speed Test.

If anyone knows how to change the link speed to 1gbps that would be great!

 

Windows 10 download speed locked at 100Mbps

Update: I have tried to see where the problem is located. I tried the ethernet cable on a different system, and that system was able to get full download speeds. I tried switch the plug, and that didn't help either. I reset the router, and tried a different ethernet cable but this didn't solve the problem either. I installed a new copy of Windows on a different drive and booted my system of that drive, and the ethernet was still pegged at 100Mbps. I then decided to see if the problem was with Windows, so I booted off of a drive with the latest version of Ubuntu Linux on it. It also read the ethernet speed at 100Mbps, so I thought that it might be a problem on the motherboard side, since both OS's were reading the same thing. I updated the BIOS to the latest version, but this hasn't helped the problem.