Reset Internet Explorer to default settings

From https://support.microsoft.com/en-us/help/17441/windows-internet-explorer-change-reset-settings

You can reset Internet Explorer settings to what they were when Internet Explorer was first installed on your PC. This can be useful for troubleshooting problems that may be caused by settings changed after installation. Note that resetting Internet Explorer isn't reversible, and all previous settings are lost after reset.

1. Close all Internet Explorer windows. Select the Tools  button, and then select Internet options.
2. Select the Advanced tab, and then select Reset.
3. In the Reset Internet Explorer Settings dialog box, select Reset.
4. When Internet Explorer finishes applying default settings, select Close, and then select OK. Restart your PC to apply changes.