I had no idea what board to post this on.

I need some help.
On my desktop, there seems to be an annoying red line stretching vertically across the screen. It's only on the desktop, not when I pull up any other window such as paint or internet explorer. And it doesn't go away with any other wallpapers. It just turned up about a month ago, and I've tried refreshing the desktop and re-aligning the icons but nothing works. Anybody have suggestions?
 
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