A Basic Application Could Not Be Started Wincc 7.5 Instant

Corrupted COM registration can cause the “basic application” loader to fail.

WinCC 7.5 uses a named instance of SQL Server (e.g., WINCC or SQLEXPRESS).

Ensure they are Running and set to Automatic startup.

If stopped, right-click → Start.

If the service fails to start, check the Windows Event Viewer for SQL-specific errors. A Basic Application Could Not Be Started Wincc 7.5

Overzealous antivirus software (especially McAfee, Norton, or even Windows Defender real-time scanning) can quarantine or block the launch of .exe files that WinCC needs.

Data Execution Prevention (DEP) is a Microsoft security feature that sometimes flags older WinCC processes as threats. Ensure they are Running and set to Automatic startup

Click Apply, OK, and Restart your computer.

This error is rarely a hardware issue — it’s almost always software or permission-related. Start with the simple fixes (admin rights, service restart) before moving to reinstallation.

👉 If you’ve solved this differently, please share your solution below! If the service fails to start, check the

This single action resolves the majority of cases.

Why this works: WinCC 7.5 needs to write to protected system folders (like C:\ProgramData\Siemens\) and register COM objects at runtime.

Try the following solutions in order. Test after each step.