What should I do if reinstalling Steam doesn't fix the 'unexpected error,' based on Reddit advice?

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Grade: Education Subject: Support
What should I do if reinstalling Steam doesn't fix the 'unexpected error,' based on Reddit advice?
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Reddit suggests checking the Steam installation directory for any leftover files after uninstalling. Manually delete these files. Also, consider running a malware scan, as malware can sometimes interfere with Steam's operation. A fresh Windows installation is a last resort mentioned by some users.