System Restore error 0x81000203

Question

I recently realized that my System Restore isn't working. Whenever I open System Properties or "Create a restore point", it gives me an error message.

What I've tried:

• According to https://superuser.com/questions/774607/windows-8-system-restore-failing, disabling UAC can prevent Windows applications from working. But checking my registry, EnableLUA is set to 1 (on).

• According to another Q&A site, running rstrui.exe opens the System Restore dialog. But in the dialog, it says I don't have any restore points and it directs me to the System Properties page.

• This Microsoft community post suggests editing the SR policy from gpedit.exe, and confirming that Microsoft Software Shadow Copy Provider and Volume Shadow Copy services were running.

• Running an SFC scan to replace corrupt files can fix certain features. See my other question for details.