My macbook air isn't connecting right to my wifi

So I have a macbook air, I just got it maybe two months ago. My wifi connection has been acting up the past few days. if I go to settings, it says my wifi is connected, but it does not show the wifi symbol at the top bar. Also, things like google chrome and receiving mail are working. But if I go to iTunes or app store and try to download something, it says the connection failed. Also, I keep seeing a notification when I try to open the iTunes store saying: "We could not complete your iTunes store request. An unknown error occured (-54)." My wifi is connecting fine to other devices. What is wrong and how do I fix this?

Go step by step and test.
1.Power Cycle
   Power off the router. Unplug it from the wall. Wait a while.
   Plug it back to the wall. Power the router on. Wait until all the lights are lit properly.
   It will take a while.
Restart the computer.
Start up in Safe Mode.
   http://support.apple.com/kb/PH11212?viewlocale=en_US
2. Turn off Extensions, if any.
     Safari > Preferences > Extensions
     Relaunch Safari.
3. Turn off proxies, if selected.
     System Preference > Network > Advanced > Proxies Tab
     Under "Select Protocol", uncheck any box if selected.
     Click "OK" then "Apply"
4. Uninstall anti-virus software, if any.

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My macbook air isn't connecting right to my wifi

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