Hi Jefferson,
Thanks for posting your issue.
At first, we do NOT support install ADMS Console on Windows 7 platform. I suggest you turn to a server series OS(Windows Server 2003 or 2008) for ADMS installation.
If the warning appears during the pre-check, it will not prohibit your installation process, but MAY have some issue when using.
You can uncheck the option“Use default IIS configuration”before you click "Install" button on installer UI, change the port number other than 80 (between 1 and 65535) to use a customed port on ADMS Console.
I don't think your check in issue is caused by windows firewall.
Thanks,
-Dicky
Dicky Shu
SQA Engineer
PSEB-GE-ACRD PSEB
Autodesk, Inc.