troubleshooting network

Hi! I just got windows set up on this pc, and can't connect to the internet. I have looked through lots of videos and websites but none of them seem to have the same problem. In the wifi icon at the bottom all I see are the Network Settings and airplane mode, no toggle-able wifi switch to turn...

I work in a big office. Network mentioned here contains routers, firewall, switches, server, telephones and other end users. And an issue is going around with the computer network of office. Problem can be better elaborated as this: Everything works fine for sometime and then suddenly the...