The CF forum is your friend....
Moving this discussion to the Cold Fusion forum.
After I have uninstalled Apache and all coldfusion and rebooted, I have installed cf10 using the built in server. When I click on administrator on the start menu and try to go to http://localhost:8500/CFIDE/administrator/index.cfm, get a response of Firefox can't establish a connection to the server at localhost:8500. It will do this whether I stop or start the coldfusion server. None of the logs show any errors. If I uninstall cf10 and reinstall cf8, cf8 works correctly. Anybody have any ideas what to try next?
Which logs were you looking at (which exact files)?
Are you certain CF10 is listening on 8500? (set in [CF directory]\cfusion\runtime\conf\server.xml)