Hi cuditbeso , try to setup proper driver for wifi.Just visit following site and download wifi driver and install it. Download wifi Driver I think your problem will be solved.
I did clean re-install of windows 8 from a cd that Dell sent me when they first fixed my new computer. The reinstall programed on the computer was no good, so sent it back, they fixed it, but sent me an install only for dell cd for windows 8. Did the install, went to wireless in setup, it showed me the two options for wifi and airplane mode. When I clicked on airplane mode both option disappeared.  Unable to find a way to get wifi. They also sent me a dell drivers disk, installed the wifi adapter they had, but when I go to device manager there is none. I have three objects with an exclamination point by them. They are Network Controller, PCT Simple Commuications Controller and VSB2.0 CRW. The install CD was for 3521/5521 and or 3721/5721. Right now I have no connection to the internet, unless I try an Ethernet connection. Why would I have this problem using a Dell Install CD? Can you help me get my wifi back so I can add my programs etc? Let me know how to reply to your answer also as I am new at this. Tks 
Inspiron 3521, Clean Windows 8 install, no WIFI connection