Web browser doesn't open (Internet Explorer)

Maybe an add-on modified the Internet Explorer's Settings and that is why it doesn't open. Resetting its settings via Internet Options should fix the issue. To reset it, follow the steps below:

1. Go to Control Panel and select Internet Options
2. Click the Advanced tab
3. Select the Delete personal settings check box
4. Click the Reset... button -> Click Apply and OK
5. Quit Internet Explorer and run it again

The Windows Troubleshooter is designed to help you resolve issues like this in an easier way. To access it:

1. Open the Windows Store Apps troubleshooter by following the steps below:
   
   Press Windows key + X and click on Control Panel -> Click on Troubleshooting and click on View All
   
   
2. Click on Windows Store Apps troubleshooter designed to help you fix problems with Windows Store Apps. Follow the on-screen instructions and restart the computer once you are done.

Note: The Reset Internet Explorer Settings feature might reset security or privacy settings that you added to the list of Trusted Sites. The Reset Internet Explorer Settings feature might also reset the parental control settings, too.