IIS and Apache ports

Hello i have apache and IIS installed on one machine. Now I am facing the Port issues. Right now I set the Apache to run on port 8080, and IIS port 80. IIS product doesn't get to used much, therefore, I want to swith IIS to port 8080 and apache to port 80. But I don't know how to. I tried to change TCP port, and restart IIS, and changed httpd.config of apache to 8080, it seems that only the apache is working but not the IIS.

has anyone used viewvc without having to use IIS? that would be helpful too.

Thanks, guys.