How to Turn on wireless capability in Windows 7

First Troubleshoot

check your laptop if merong physical switch button baka accidentally na off nyo lang search nyo nalang sa google ang brand/model ng laptop nyo. if wala proceed po tayo sa second troubleshoot.

Second Troubleshoot 

This happens because power management turned off wireless capability when not in use. You can change this setting:

1. Open Network Connections
2. Right-click on the wireless connection
3. Click Configure next to the wireless adapter
4. Click the Power Management tab
5. Uncheck "Allow the computer to turn off this device to save power"