I'm not very clued up on IIS, but I'm trying to do something that I thought would be quite simple.

In IE, if I browse to http://localhost:80, I am greeted with a pretty picture with a bunch of welcome messages and a big "IIS7", thanks to the graphic designers at Microsoft.

In IE, if I browse to http://mycomputername:80, I'm greeted with 404.

It may be my fault... perhaps I've done something weird. Chrome replies 404 to either of those.

Should this work, and if so, what am I doing wrong, or what can I do to get it to work?

What might cause this to happen and how can I fix it?

EDIT

To add a bit more information. I did find after posting this question that http://localhost:80 was the only URL I could access on my local PC. I could not access any of the virtual sub-directories on localhost via my browser.