When it comes to a Security Suite, given how well Windows Security has been testing out for several years now I say stick with it.
As far as internet goes, check the OEM's website for the latest device driver for your WiFi card, and if the version is newer than what you have then download and install it. If you happen to have a WiFi card, do a web search on [Intel Download & Support Assistant Download] then get it from the appropriate page. Intel keeps churning out driver update after driver update under Windows 10 and has either not supplied same to the computer OEMs and Microsoft in a timely manner or the latter are not doing their customizations and putting them out on their own websites or into The Great Microsoft Driver Library in the Cloud in a timely manner.