Black vertical line across desktop?

I have a Lenovo y50 touch and there's a black vertical line across my desktop but only on the screensaver. It doesn't show up on any program.

Added (1). I have a Lenovo y50 touch and there's a black vertical line across my desktop but only on the screensaver. It doesn't show up on any program.
Update: Sorry I forgot to mention that I tried changing my screensaver and it still has the line on it no matter which I choose.

Change to a different screensaver.

Right click your desktop and go to personalize. Select the screensaver of your choice. If you like the current one, then deselecting the file and reselecting it should fix the problem. If not, the file is corrupted which can be fixed by simply googling it and downloading another copy.