You configure Internet Explorer 11 to use a custom style sheet through Control Panel > Internet Options > Accessibility > User style sheet > Format documents using my style sheetand by then entering the value for an existing style sheet on your computer. Then, you start Internet Explorer and navigate to any website. In this situation, Internet Explorer 11 may crash when the User Stylesheet value is deleted from the following registry subkey:
HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Styles