A Basic Application Could Not Be Started Wincc 7.5 Access

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

WinCC cannot function without its database. A Basic Application Could Not Be Started Wincc 7.5

Ensure their Startup Type is Automatic and Status is Running.

If stopped, right-click → Start.

If they fail to start, open SQL Server Configuration Manager and check if the instance is disabled or using a conflicting port.

If you have tried DEP, Admin rights, SQL, and the cache delete without success, you are likely dealing with a Windows Update conflict. Ensure their Startup Type is Automatic and Status

Microsoft’s monthly patches have a history of breaking Siemens software. Check the Siemens Support Portal (Entry ID: 109753080) for the latest hotfixes. You may need to uninstall the most recent Windows Cumulative Update or roll back to a System Restore point from last week. If you have tried DEP, Admin rights, SQL,

Data Execution Prevention (DEP) is a Microsoft security feature that sometimes flags older WinCC processes as threats.

Click Apply, OK, and Restart your computer.

If core files are missing:

Modern Windows (10/11) restricts permissions aggressively. The "basic application" might be failing because it lacks write access to system logs or temp files.