windows wifi disable 5ghz
1. In Device Manager, right-click on the Intel card and select Properties
2. Then click on the Advanced tab.
3. You will see an option called Wireless mode. Set the mode from 802.11a/b/g
to just 802.11b/g. This will prevent the card from scanning or accessing the
5Ghz 802.11a band and just leave you with the 2.4Ghz b/g band to work with.