General:
You'll need to change your computer's region/language settings to use Exam4.
Also Note: If you are running Windows 10 Single Language Edition with a Non-English language, you will be unable to run Exam4. Click here to find out what version you are running. To run Exam4, upgrade to a supported version of Windows OS. Check Exam4 Supported Operating Systems for more information.
Region Settings Instructions
Set the Language for non-Unicode programs under Region Settings to "English (United States)".
Please complete ALL steps to fix this issue:
1. From the search box at bottom left corner of your Windows screen: Start typing the word "Region".
2. Select “Region settings”.

3. Scroll down to “Related settings” and click "Additional date, time & regional settings". (Windows 11 users may need to find "Administrative Language Settings" to get to the "Region" window, and then skip to #5 below.)
4. On this "Clock and Region" window - click "Change date, time, or number formats" under "Region".
5. On this "Region" window"- click on the "Administrative" Tab.
6. Click on the "Change system locale" button.
7. Make sure the “Current system locale” box is set to English (United States) - and that the "Beta: Use Unicode UTF-8..." checkbox is DISabled (not checked).
8. Click OK on each window and close all windows.
9. Make sure the computer's calendar is set to "Gregorian"
Reboot your computer, and run a practice exam.
[ For better viewing: Right click on the image and select "open image in new tab" (or window) ]

Important: Beta UTF-8
Additionally -
We have seen that some versions of Windows may have the "Beta: Use Unicode UTF-8 for worldwide language support" checkbox enabled by default.
As shown in the image above (below #7), that checkbox should be DISabled.

Be sure to reboot your computer for these settings to fully take effect.