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Hi, I bought C7 router and after the installation I noticed that the internet on my PC is not as fast as before. I confirmed it via SpeedTest. I ran the SpeedTest also on my phone and laptop and the results were fine, so the issue lies in connection between my PC and router. The PC has Archer T4U V1 USB card. It seems it doesn't work well with C7 router. Do you have any suggestions? I don't want to buy another device.

SpeedTest from PC (same room as the router):

Laptop (it's far from the router in a different room in the apartment)

Phone (I am using it next to the PC)

I tried using latest Archer T4U V1 drivers - https://static.tp-link.com/Archer%20T4U(UN)_V1_161223_Windows.zip - but the card doesn't work at all with them, and Windows is throwing errors:

WLAN Extensibility Module has failed to start.

Module Path: C:\WINDOWS\system32\Rtlihvs.dll
Error Code: 126