FIX: Windows 10 Calendar App Not Working
Method 1. Make sure Windows Update is Enabled
Step 1. Press Windows Key + R then type services.msc into the dialog box. Click OK and open the Windows Services.
Step 2. Then you should locate Windows Update and double-click it to open its Properties window.
Step 3. Make sure the startup type is set to Manual or Automatic. If it isn’t, you have to choose one of those options from the Startup type drop-down menu. Next, you click Apply button and click OK to save the settings.
Method 2. Using Diagcab Troubleshooter app troubleshooter
Step 1. Go to this website to download and run troubleshooter at Microsoft Solutions.
Note: This troubleshooter also has .NET Framework 2.5 and 3.5 enabled on your system.
Step 2. Then, you right-click the troubleshooter’s exe and click Run as administrator to open its window. Now, you will see an initialization program bar in the background.
Step 3. Next, you click the Next button on the troubleshooter’s window to repair the Calendar app.
Step 4. When the troubleshooter has done its repairs, you restart Windows 10.
Method 3. Clear the Windows Store Cache You should be able to fix this problem simply by clearing the Windows Store Cache. To do that, follow these steps:
Step 1. Press Windows Key + X then select Command Prompt (Admin).
Step 2. When Command Prompt window occurs, you type WSReset.exe and press Enter. Now Command Prompt is clearing the cache
Step 3. Wait until that reset operation completes, and the Store window will then open.