You need to uninstall/disable/reconfigure the blocking application
[Apache] or reconfigure Apache and the Control Panel to listen on a different port
My problem is that as the only other programs I am running are Dreamweaver and Internet Explorer or Chrome and I don't see why that would be a problem as they were running before I started Apache.
I am not sufficiently knowledgeable about the inner workings of the OS to be able to track down the offending program.
How can I stop this happening.
Many thanks for the help.