A Basic Application Could Not Be Started Wincc 75 (2026)

Corrupted runtime files are a prime suspect.

  • Do not delete the MEL or PDL folders.
  • Reactivate the project.

    • Project corruption is a leading cause. Use the WinCC Project Duplicator (Start menu → Siemens Automation → WinCC → Tools):

    The duplicator rebuilds the SQL database and repairs minor inconsistencies.

    | Feature | Description | |---------|-------------| | Error text | "a basic application could not be started wincc 75" | | Affected software | Siemens WinCC (Version 7.5) — often Runtime or Explorer | | Commonly appears when | Starting WinCC Runtime, opening a project, or after a Windows update | | Primary symptom | WinCC fails to launch the basic application (e.g., graphics runtime, global script, or tag management) | | Typical error codes (accompanying) | May appear with 0x8000FFFF, 0x80040154, or HRESULT errors in Windows Event Log |

    WinCC uses DCOM for inter-process communication. Incorrect DCOM settings block basic apps.

  • Under COM Security tab:

    • Caution: Only modify these if you understand the security implications. Consider backing up DCOM settings first. a basic application could not be started wincc 75

    If you want to debug this manually:

    Would you like a PowerShell script that acts as a simple watchdog for this specific WinCC error?

    When the error "A basic application could not be started" WinCC V7.5

    , it typically prevents you from creating or opening projects.

    This issue is often tied to software incompatibilities, licensing conflicts, or corrupted SQL Server instances Common Causes Operating System Incompatibility: Corrupted runtime files are a prime suspect

    Running WinCC V7.5 on unsupported Windows 10/11 builds (e.g., Windows 10 Business or certain newer 22H2 builds without specific updates). SQL Server Corruption:

    An incomplete or failed installation of the Microsoft SQL Server instance used by WinCC. Software Conflicts: Coexistence with incompatible software like WinCC Professional (from TIA Portal) on the same machine. User Permissions: The logged-in Windows user is not a member of the local "SIMATIC_HMI" user group. Special Characters:

    The computer or server name contains special characters (like underscores), which can break the SQL instance installation. Recommended Solutions

    wincc problem (a basic application could not be started ) - SiePortal

    The error "A basic application could not be started" in WinCC V7.5 typically indicates a mismatch between your software version, the operating system, or an improperly installed SQL Server instance. Primary Troubleshooting Steps Do not delete the MEL or PDL folders

    Verify OS Compatibility: Ensure your version of WinCC V7.5 is compatible with your Windows build (e.g., WinCC 7.5 SP2 often requires Update 15 to function correctly on Windows 10 Pro 22H2).

    Run Reset_WinCC: Locate and run Reset_WinCC.vbs in the WinCC Bin folder, then restart your computer to clear hung processes.

    Check SQL Server: If the computer name contains special characters (like underscores), the SQL instance may have installed incorrectly. You may need to uninstall both WinCC and SQL Server and reinstall them starting with a clean machine name.

    Update Microsoft Edge: Outdated versions of Edge can disrupt SQL Server installations on Windows 10 version 20H2. Ensure Edge is updated to v86.0.622.56 or higher. Secondary Solutions

    Although WinCC often gives specific license errors, a severely mismatched or missing license (e.g., RT vs. RC, or insufficient tags) can sometimes manifest as "basic application could not be started" during early runtime initialization.

    If none of the above resolves the issue, gather the following and open a ticket with Siemens Industry Online Support:

    Siemens support can perform deeper analysis using internal debugging flags (/@/DEBUG in runtime start parameters).