| Attribute | Details |
|---|---|
| Error Code | 0x426-0x0 |
| Software Affected | Microsoft Excel 365, Office 2019, Office 2021 |
| Root Cause | Disabled “Click-to-Run” Service or Corrupt Installation |
| Quick Fix | Restart the Click-to-Run service via Services.msc |
What is Excel Error 0x426-0x0?
Excel Error 0x426-0x0 is a common communication failure that occurs in Microsoft 365 and standalone Office versions. It typically triggers when a user tries to launch Excel, Word, or Outlook, but the background streaming service fails to respond.
This error is closely tied to the **Microsoft Office Click-to-Run** technology. If this service is disabled, stalled, or blocked by a third-party firewall, the application cannot verify its license or load the necessary core files.
In most cases, this isn’t a sign of permanent data loss. Instead, it indicates that the communication bridge between your local Windows environment and the Office installation files has been severed.
Step-by-Step Solutions
Method 1: Restart the Microsoft Office Click-to-Run Service
The most frequent cause of error 0x426-0x0 is a disabled background service. Follow these steps to re-enable it:
1. Press Win + R, type services.msc, and hit Enter.
2. Scroll down until you find Microsoft Office Click-to-Run Service.
3. Right-click it and select Properties.
4. Set the “Startup type” to Automatic.
5. Click Start if the service is stopped, then click OK.
Method 2: Run the Repair Command via Bash/CMD
If the service is stuck, you can force a refresh using the command line as an administrator.
sc config "ClickToRunSvc" start=auto
net start "ClickToRunSvc"This command ensures the service is set to start automatically and initiates the process immediately.
Method 3: Repair Office via Control Panel
If the service restart doesn’t work, your installation files might be corrupted. Windows includes a built-in repair tool for this purpose.
1. Open the Control Panel and go to Programs and Features.
2. Locate your Microsoft 365 or Office installation in the list.
3. Click Change at the top of the window.
4. Select Quick Repair first. If that fails, repeat the process and choose Online Repair.
Method 4: Disable Conflicting Third-Party Firewalls
Sometimes, non-Microsoft antivirus or firewall software flags the Click-to-Run service as suspicious activity.
Try disabling your third-party antivirus temporarily. If Excel opens successfully, you will need to add an “Exclusion” or “Exception” for the Office installation folder within your antivirus settings.
Method 5: Complete Reinstallation
If all else fails, use the Microsoft Support and Recovery Assistant (SaRA) tool to completely remove Office. A fresh installation often resolves underlying registry conflicts that manual repairs cannot reach.