Following the installation of Windows 10 May 2020 Update, various users have been unable to use the Windows 10 Reset feature. When attempting to use "Reset this PC", the feature fails to work and returns the following error message: "There was a problem when resetting your PC. No changes were made."
1. Open an elevated command prompt. To do this, click Start, type Command Prompt or cmd in the Search box, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
2. Type the following command, and then press Enter:
dism /online /cleanup-image /restorehealth
3. Reboot your system, and attempt Reset this PC again.
A patch is expected to follow but Microsoft didn't provide a timeline.