Try this: How to change the network connection priority in Windows 7 - Microsoft Support
support.microsoft.com
You can disable the wifi card from adapter settings if you won't be using it at all. Just right click and select disable or if this is a laptop there might be an on/off switch or hot key. You can also edit the passwords to remove the wireless one. How to find the wireless password on Windows 7/8/10 if my wireless network is already generated | TP-Link www.tp-link.com
My mum got fast internet a few years ago, It was months later that I noticed that they used wifi to connect i was not happy either.
The reason in her case was that for the person installing the router it was just easier.
An other reason could be that the installer would have to drill holes in the wall or threw the floor and the person is not qualified to do that type of work.
Very good point Digital Life. I have drilled or enlarged holes in my home so I can use ethernet vs wifi. Best paces are where pipes come up for water, registers etc. I bought a 50 foot ethernet cable once at home Depot for 20.00. Much better than wifi. you plug it in, it works.
Wireless is now faster than cable for a lot of people if you have old network cables and good wifi it can be faster 802.11ac transmits at a top speed of 1300 Mbps, almost three times faster than the 450 Mbps of 802.11n.
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