If the error persists after these steps, it is highly recommended to for any specific Service Pack 2 or Update 15 known issues and to ensure your SQL Server instance is functioning properly. Share public link
The "basic application could not be started" message is generic. Windows Event Viewer will tell you exactly which application failed.
: If you are trying to open WinCC Explorer to develop a project, ensure you have an RC (Runtime + Configuration) license activated, not just an RT (Runtime) license. a basic application could not be started wincc 75 best
If the error occurs only for a specific project but other projects open fine, the project database cache is likely corrupted.
Over time, security updates or third-party software can unregister WinCC’s custom DLLs, breaking the startup sequence. Re-registering forces Windows to recognize them again. If the error persists after these steps, it
What specific and WinCC 7.5 Service Pack (SP) update level are you running? Share public link
Always start WinCC Explorer using the "Run as Administrator" option. : If you are trying to open WinCC
Force add the active Windows user to the local SIMATIC_HMI group. Services & Networks Check system daemons and Terminalbus properties
Even if you think you have a license, a mismatch can trigger this error. Open the Automation License Manager .
Open the SIMATIC Security Controller from the Windows Start menu.