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Internet Explorer can't be opened using the Built-in Administrator account
Written by: Will Kruss on 12 September 2014 11:13 AM
If modern UI apps can't be opened using administrator account in windows 2012 R2 internet explorer, follow the article.
When you install a Windows 2012 R2 server, if you login as Administrator and try to run any Modern UI Apps (such as Internet Explorer) you’ll get this error message: “This app can’t be opened using the Built-in Administrator account please sign in with a different account and try again.” or “This app can’t be activated by the Built-in Administrator”.
You can either create a new user account in the Control Panel and then login as that user.
Or alternatively modify Windows security policy: