I have a plan of 200 mbps and it works well in all of my electronics (Phones, Laptops, etc) including my Linux partition on this same PC. But on Windows the browsing and downloading speed is usually not over 70 KBps but when downloading using Free Download Manager it speeds up to 8 MBps.
This PC has a MSI Mortar Motherboard for 12th gen Intel (Don't have the part number accessible at). I have tried reinstalling drivers, configuring DNS, using a VPN, etc, etc. But I cannot get the internet to work. Using Windows 11.