Consider working through these steps:
- Reset Overwatch’s Video Settings
- Update your graphic card driver.
- Reset your graphic card driver settings., then make sure that your Graphic Card Driver control panel is configured correctly for Overwatch. This includes setting Overwatch at Maximum Performance (not optimal power) for Power Management and making sure it set to run on the graphics card and not the motherboard chipset.
- In drastic cases you may need to reinstall the driver and update to the most recent driver for your card. Remember to use Display Driver Uninstaller to completely clean out your old driver. Then download the most recent [NVidia]