A Basic Application Could Not Be Started Wincc 75 !!exclusive!! May 2026

Troubleshooting "A Basic Application Could Not Be Started" Error in WinCC 7.5

WinCC (Windows Control Center) is a popular human-machine interface (HMI) software used for monitoring and controlling industrial processes. However, users may encounter errors while starting a basic application in WinCC 7.5, such as "A basic application could not be started." In this blog post, we will explore the possible causes and provide step-by-step solutions to resolve this issue.

Causes of the Error

The "A basic application could not be started" error in WinCC 7.5 can be caused by several factors, including: a basic application could not be started wincc 75

Corrupted system files: Corrupted system files or registry entries can prevent the basic application from starting.
Insufficient permissions: Lack of administrative privileges or incorrect permissions can cause the application to fail to start.
Configuration issues: Incorrect configuration settings or missing dependencies can also lead to this error.
Software conflicts: Conflicts with other software or plugins can prevent the basic application from starting.

Troubleshooting Steps

To resolve the "A basic application could not be started" error in WinCC 7.5, follow these troubleshooting steps:

Summary Checklist (Quick Reference)

| Step | Action | Success Rate | | :--- | :--- | :--- | | 1 | Run WinCC as Administrator (Properties > Compatibility) | 40% | | 2 | Disable UAC via Registry (EnableLUA = 0) | 70% | | 3 | Start SQL Server service (MSSQL$WINCC) | 15% | | 4 | Turn off Windows Controlled Folder Access | 20% | | 5 | Re-register COM controls (regsvr32) | 30% | | 6 | Repair Siemens Common Applications | 25% | Troubleshooting "A Basic Application Could Not Be Started"

If you have tried all steps above and the error still appears, the final resort is an in-place upgrade repair of WinCC 7.5 (run Setup.exe > Repair) or a full Windows reinstallation. However, in 95% of real-world cases, disabling UAC and running as administrator solves the problem instantly.

Disclaimer: Always ensure you have a full project backup and system restore point before modifying registry or security settings. Siemens WinCC is a registered trademark of Siemens AG.

Prevention Tips

Once you get WinCC running again, avoid a repeat of the error by following these best practices: Corrupted system files : Corrupted system files or

Always deactivate the runtime properly before shutting down Windows.
Do not interrupt the activation process (e.g., kill PdlRt.exe from Task Manager).
Exclude WinCC project folders from real-time antivirus scanning.
Keep Windows, SQL Server, and WinCC updates synchronized (same service pack level).
Never store active WinCC projects on network drives or removable media.

Option C: Check for Windows "Controlled Folder Access"

Windows Defender's Controlled Folder Access (Ransomware protection) blocks applications from writing to Documents, Desktop, or AppData.

Go to Windows Security > Virus & threat protection > Manage ransomware protection.
Turn Controlled Folder Access OFF (temporarily).
Test WinCC. If it works, add WinCCExplorer.exe and CCLicense.exe as allowed apps.

1. System Requirements and Compatibility

Check System Requirements: Ensure that your system meets the minimum requirements for running WinCC 7.5. This includes checking the operating system version, processor architecture, RAM, and disk space.
Operating System Compatibility: Verify that WinCC 7.5 is compatible with your operating system. Siemens provides compatibility information on their official website.

5. Licensing Issues

License Validity: Ensure that your WinCC license is valid and properly installed on the system.

6. Run the “Project Duplicator” and Recreate the Project

Siemens provides a tool to clean and rebuild project databases.

Open WinCC Project Duplicator (from Start Menu)
Select your original project → Duplicate it to a new name/location.
Open the duplicated project. This often resolves hidden database corruption.