🎮 Common Scenario: Are you experiencing Error 4390 while launching or installing Cyberpunk 2077? The solutions below directly address the system interactions specific to this application.
Flush DNS and Switch Servers: Open Command Prompt as Administrator
👇 See all 1 solutions belowThe Ultimate Auto-Fix Script
Download our advanced, custom-built Smart Diagnostic Script (.bat). It safely creates a System Restore Point, applies targeted fixes based on advanced diagnostics for Error 4390, and generates a detailed HTML repair report.
What is Error 4390?
Windows System Error Code 4390, known as ERROR_NOT_A_REPARSE_POINT, is a DNS & WINS error that occurs during DNS resolution and WINS name resolution. The error indicates that: The file or directory is not a reparse point. When this error is encountered, the Windows operating system was unable to complete the requested operation within the DNS/WINS services subsystem. The error code 4390 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_NOT_A_REPARSE_POINT maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within DNS resolution and WINS name resolution is essential for effective troubleshooting.
Common Causes
- DNS server misconfigured
- Stale DNS cache entries
- Hostname cannot be resolved
- DNS server unreachable
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Read the full guide →Step-by-Step Solutions
- Open Command Prompt as Administrator
- Run: ipconfig /flushdns
- Change DNS to Google (8.8.8.8) or Cloudflare (1.1.1.1)
- Run: ipconfig /registerdns
Video Tutorials
Diagnostic Command
Run this PowerShell command to find related events in your system log:
Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*4390*" -or $_.Message -like "*ERROR_NOT_A_REPARSE_POINT*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- Use reliable DNS (8.8.8.8 or 1.1.1.1)
- Flush DNS cache periodically
- Monitor DNS resolution performance