The error message typically occurs when Windows or a debugger (like WinDbg, Visual Studio, or a crash dump analyzer) tries to access Microsoft’s Symbol Server.
set _NT_SYMBOL_PATH=srv*D:\MySymbols*https://msdl.microsoft.com/download/symbols Use a folder inside your user profile, e.g. %USERPROFILE%\symbols . Use Process Explorer (from Sysinternals) → Find → symsrv.dll.000 → see which process has a handle to it → kill that process. Quick summary Most likely fix: Close all debuggers, delete C:\Symbols\symsrv.dll.000 (or the whole Symbols folder), then restart your debugger as Administrator. If you’re not using a debugger at all, some background application (like an automatic crash reporter) is triggering this – use Process Explorer to locate it.
rmdir /s /q C:\Symbols Right-click your debugger or application → Run as administrator . 4. Disable antivirus temporarily Some AVs (McAfee, Norton, Bitdefender) block symbol server writes. Disable real-time protection just for the symbol download. 5. Set a different symbol cache folder (if permission issues persist) In WinDbg or via environment variable:
del /f /s C:\Symbols\symsrv.dll.000 Or delete the entire cache folder (safer):