Hi Mark,
Welcome to Microsoft Community and thank you for your interest in Windows 10.
After you upgrade your computer to Windows 10, if your ViewSonic Display / Monitor Drivers are not working, you can fix the problem by updating the drivers. It is possible that your Display / Monitor driver is not compatible with the newer version of Windows. The software drivers provided on this page are generic versions and can be used for general purposes. However, computer original equipment manufacturers (OEMs) may have altered the features, incorporated customizations, or made other changes to the software or software packaging they provide. Super Contrast Ratio Widescreen The ViewSonic® VA2231wa LCD is ideal for both home and office with its fast response time and piano black finish VESA® mountable design. A true wide monitor with 1920x1080 resolution, 100,000:1 dynamic contrast ratio, analog inputs and Eco-mode for power savings! It has an automatic aspect ratio adjustment so when your input is a 4:3 signal, the image will not. If the issue still persist, I would recommend you to contact Viewsonic VA2231WM-LED manufacturer and check if they have the latest driver which is compatible with Windows 10. If the latest driver is not available for Windows 10 you can buy a new monitor which is compatible with Windows 10.
I will definitely assist you.
Let's try simple steps and check if it helps in resolving the issue. I would suggest you try updating Display driver from Device Manager manually and check if it helps. Try the below steps:
Viewsonic Va 2231
Press (Windows key + X) and click on “Device Manager”.
Click and expand “Display Adaptor”.
Right click on the device driver and select update.
Once update is done, restart the computer.
If the issue still persist, I would recommend you to contact Viewsonic VA2231WM-LED manufacturer and check if they have the latest driver which is compatible with Windows 10. If the latest driver is not available for Windows 10 you can buy a new monitor which is compatible with Windows 10.
Visit the below link for Connect a second monitor or projector
Viewsonic Driver For Windows 10
Hope it helps. If you need further assistance with Windows, let us know and will be glad to help.