If any part of your game is not displaying correctly, then it's likely your computer's graphics driver needs to be updated. Please visit the website for the company that manufactured your computer and see if they have newer drivers available.
Alternatively, you can visit NVIDIA, Intel, or AMD and look up your graphics card. Navigate to the driver for your operating system, download and install it.
Here are some links you may find useful:
Please note that you will probably need to restart your computer after installing the new driver.