Apache can't connect to http://localhost/. Port is changed to 81

I've just inst开发者_JAVA百科alled apache2.2 and installed it, but to get it running I had to change it listening port to 81. But the thing is now that I cant connect to it through localhost. The only thing I get is a login window and when I type in the authentication information that I think is my windows login. I get:

error '8002801c'

Error accessing the OLE registry.

/iisHelp/common/500-100.asp, line 17

The computer is a winxp and I've opened the ports out and no firewall is blocking apache.

Seems like the machine has another webserver running, probably IIS. You can uninstall that through the configuration screen.

Try http://localhost:81/ to get the apache install.