Open Device Manager, open the drop-down Network adpaters
Right-click Network adapters
Select Scan for hardware changes
If you can't see your Wireless adapter, go to step 11
If you can see it, right-click on the adapter
Select Uninstall ( this should only uninstall you driver software, not delete it)
Now right-click Network adapters again
Select Scan for hardware changes. This should re-detect your wireless adapter)
Once detected, restart you machine
Make sure your Wireless adapter in Network And Sharing Center is Enabled. Now try what you have to.
If you cant find you your Wireless adapter device, you may need to properly install a wireless adapter driver. You'll have to do it perfectly, or have a service person do it for your machine
PS: If you want to create a wifi hotspot (when your wireless adapter is working properly), try the following command in Command Prompt