ric-art07:some friends told me to install IIS and Exchange Server on separate machines
Exchange uses IIS. If you have a single IP address on the server, they are trying to use the same IP/Port combination, so one will fail. Add a second IP and use that for your web site. And please, specify exact error messages. We can't see your screen unless you turn it to face the window and open the blinds.
Jeff
Look for Wrox's new book Professional IIS 7 in your local bookstore, or order now at
Amazon.com