Why can't Windows 8 find the Startup Folder?

First, please swipe up from the bottom of the screen when using Modern UI (If you're using a mouse, please right-click the mouse), then click "All apps".

Then click "Run".

Next, please enter shell:startup, and click "OK" after you are done.

The long lost "Startup" folder appears. Now, you may put all the shortcuts of the programs you want automatically started into the folder.