http://www.tomshardware.co.uk/faq/id-2080296/add-programs-startup-windows.html
press Windows + R keys simultaneously to initialize the Run command box.
Once the Run command box is opened, type %AppData% in the available field and hit Enter.
On the opened Roaming window, go to the Microsoft > Windows > Start Menu > Programs > Startup folder.
Once you are inside the Startup folder, paste the shortcut that you copied by right-clicking anywhere and selecting the Paste option from the context menu