A Basic Application Could Not Be Started WinCC 7.5 Best Fixes & Troubleshooting Guide
WinCC uses DCOM (Distributed Component Object Model) for inter-process communication. If Windows Updates changed DCOM security permissions, WinCC cannot "call
Install WinCC after the operating system is fully updated and TIA Portal (if used) is installed.
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In this article, we will outline the best troubleshooting steps and best practices to resolve this issue, ensuring a stable WinCC 7.5 SP2+ operating environment.
Ensure your Windows user account is a member of the local user group. This is mandatory for WinCC operation. Also run WinCC “as administrator” by right-clicking the application icon and selecting that option.
WinCC 7.5 / "A basic application could not be started" message A Basic Application Could Not Be Started WinCC 7
| Symptom | Solution | |---------|----------| | Error only in one project | Use to create fresh copy | | Error after moving project | Check path length < 80 chars, no special characters or spaces | | Error after Windows Update | Run WinCC Installation Repair from Control Panel → Programs → Siemens WinCC → Change → Repair | | Multi-user / client-server | Verify network share permissions (full control for Everyone temporarily for test) |
2. Install the Correct Service Packs and Updates (Crucial Fix)
Never skip version upgrades. If you are upgrading from an older version, update the project incrementally to ensure compatibility with V7.5. Summary Checklist Run Reset_WinCC.vbs Clears faulty database/temp files Install Latest SP/Update Solves Win 10 22H2 compatibility Check SIMATIC HMI Group Fixes permission issues Check SQL Services Ensures database connection Ensure your Windows user account is a member
If the error persists, the WinCC installation itself or the Windows Registry keys regarding DCOM permissions may be damaged.
: Execute the Siemens Security Controller to re-apply necessary local security settings .
WinCC requires specific user permissions. If the user running WinCC is not part of the correct Windows groups, core services cannot start.