The major reason for not detecting wireless networks on a wireless computer is the wireless service WZC (Wireless Zero Configuration) is not started. After starting the Wireless Zero Configuration most of the wireless related issues will be resolved.
How to Enable Wireless Zero Configuration
1. Click on start
2. Click on Run
3. On Run window type services.msc hit Enter
Now the services windows will be opened. The WZC (Wireless Zero Configuration) is third service from last.
4. Open the service and click on start button to enable the WZC service.
I think it helps to resolve your Zero configuration issue