Maybe you have some drivers or packages missing. This worked for me: WiFi icon on wing panel disappeared. Try it. I face such an issue many times (mainly after huge updates) and, until it is fixed, we will experience that problem.
Why are you asking a window$ question and a linux site?
I would suggest you take this question to a window$ site, or delete window$ and install elementary and all your problems will go away, well maybe not all of them. lol
Sounds like you are missing a driver. I had a similar problem and was fixed when I ran updates after install. If not you need to find you wifi card and download the driver for it. What are the specs for your computer?