Why doesn't Wifi Sync work after updating ITUNE?

Hello, I updated my Itune to 11.1.4.62 version.

After updating, WIFI sync doesn't work anymore. I have to connect the cable to my laptop to sync it. Before this upgrade it was working fine.

Now, I have Iphone 5. I run Windows 7.

I did all the recommended trouble shooting.

I disconnected the model and router and reconnected again.

On Summary page the Wifi Sync is CHECKED

I ran the diagnostic, but obviously it says iphone is not detected.

I reseted my iphone.
It still doesn't work.

How can I solve this matter and why does Apple have so many irrtating problems like this?