inetinfo - inetinfo.exe - Process Information
Process File: inetinfo or inetinfo.exe
Process Name: IIS Admin Service Helper
Description: InetInfo, which is part of Microsoft Internet Information Services (IIS) and is used for debugging. The service is seen primarily on Windows NT 4 or 2000 Server where InetInfo provides Internet proxy and web server services.
Company: Microsoft Corp.
System Process: Yes
Security Risk ( Virus/Trojan/Worm/Adware/Spyware ): No
Common Errors: N/A

Well, can you disable IIS service and see if you could use port 25?
It is not an essencial service, so you can disable it… anyway, strange you found this. For me, IIS is set to ‘manual’, not automatic. :wink: