If none of the other solutions helped you fix error 0x803D0000, reinstall the device's operating system. Before you reinstall it, make a backup of your personal data (pictures, music, videos and other invaluable documents) on an external hard drive, or on an online backup solutions like Google Drive, OneDrive, etc., to avoid losing them in the process.
Feel free to use the don't know how to install an operating system guide to learn how to (re)install your computer's operating system, safely.
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