Original post by: Laptop Repair Guy ,
1. Try fixing keys using this [http://www.laptoprepair101.com/laptop/2007/03/20/key-fell-off-keyboard/|Laptop Key Repair Guide.] 2. If repair not successful, you'll have to replace the whole keyboard. New keyboards available on eBay very cheap. 3. Keyboard replacement instructions published in [http://www.laptopmanualshub.com/|Dell Service Manuals]. Find your Dell laptop model and follow the instructions.