Hi Kevin. Thanks for your answer.
The problem is about the notebook cannot detect WPA2 wireless networks. But only Airties brand modems. Let me tell you in order.
First, I create a wireless network secured by WPA/WPA2 common mode. There is no problem. PC can easily detect and connect the network. After that, I change the security to only WPA2 in modem's UI. Same wireless network. The only difference is the security. But suddenly PC cannot detect the same network. Same wireless network name. But it disappears. I have talked about this problem Asus Turkey Service Center. I had recorded a video about this problem. They said 'you are right. We watched the video. We could see the problem. But We have tried our own modems and we couldnt see the problem.' So they dont help me. Neither Asus Turkey nor Airties help me. Because they say that they cannot detect any problems.
They are right because this problem is about Airties modems. But I want to add something. The problem I have doesnt occur while using Windows 8. İt appears only when I update windows from 8 to 8.1. Because W8 drivers dont cause this problem. While using 8, I dont see that.
Sorry for bad English. But This is all I can do. I will upload a video to Youtube about this.