Thank you for the post.
First, Windows 8.1 is not tested to be compatible with FileMaker Server 13. For a list of all the operating systems tested, please review the following:
"Operating systems not listed in the table (in the article) above have not been tested and are not supported."
The error in the screenshot indicates that something (other than FileMaker Sever 13) is using either port 80 or 443 (or both); otherwise, the ports are blocked by security software or a firewall.
FileMaker recommends a dedicated machine for use only as a FileMaker Server and needs exclusive control over those ports.
For more information, please review the following: