1. Are the streaks caused by software? Make sure the monitor is not working properly.
If the streak appears on all windows and on the toolbar at the bottom of the screen (if not as shown), it is due to the monitor and not to the software.
2. Move the monitor. If the stripes move along, it may be because the cable connecting the monitor and motherboard is loose.
3. If the streak does not disappear on the monitor and is always visible, connect it to an external monitor and set it as the mirror of the original desktop.