I have nosound onmy computer and they keep askingfor an license key and I don't know where to find it please help

Do you have an official copy of windows ?

Have you tried updating the drivers? If not try going to the control panel and then go to device manager. Click on "sound, video,, and game controlers." Select the first driver under this. A box should come up. Select the "driver" tab next to "general" at the top of the box. Then select "update driver" to update the sound driver. Restart your computer after the update is done. If there still is no sound update the other drivers under "sound, video, and game controlers."