Need Help with Duplicate Key [+] while working on a notebook

Hi Everyone, 

     I use to work for a medical journal & duplicating objects is the most used function for me. I switched to notebook from a desktop & one thing is bugging me that I cant duplicate object like I used to do on my desktop using a [+] key on my numpad. It might be working with function keys or maybe something else, I almost tried everything I possibly could. Any suggestions as using ctrl+D won't place the duplicate object on the same place. If some knows anything about it please share Smile

regards,

Laiq Atiq