check that your wifi Card is recognized in your Device manager.
-Follow the steps below to check your adapter device's status in Device Manager:
- Right-click My Computer and select Properties.
- Click the Hardware tab then Device Manager.
- Click the + sign beside Network adapters to expand.
if its there, update your drivers.
plug your device in via LAN cable, and run a windows update.
if these dont work, you may need to replace your card, should there be a problem with it, itself.