Right click on the Start button and select Run. Type cmd.
In the command prompt window type netsh wlan show drivers then press enter.
Next to Radio types supported verify the network modes supported by your network adapter.
If you see 802.11a, 802.11g, 802.11n and 802.11ac network modes, then your computer has 2.4 GHz and 5GHz network capability and you will be able to enable the band to 5GHz. Follow the steps below.
If you see 802.11n, 802.11g and 802.11b network modes, then your computer has 2.4GHz network capability only and you will not be able to enable 5GHz.
Steps to set band to 5GHz
Right click on the Start button and click Settings.
Select Network & Internet
Select Wi-Fi
Scroll to Related settings and click on Change adapter options
Right click on your Wi-Fi connection and select Properties
In the Wi-Fi Properties box you will set the Wireless Mode
Click on Configure
Select the Advanced tab:
Under Property scroll to select 802.11a/b/g Wireless Mode
Under Value select Dual Band 802.a/g
Under Property select Preferred Band
Under Value select Prefer 5GHz band
Optionally you can set the Roaming Aggressiveness to Medium