Thanks Nic,
Got that sorted out now, but I did not get a tick next to pipeline integration. When I saved the general page and clicked on the AD page, I received an error telling me to add in the section. When I did this, I was presented with a login screen when I went to setup.aspx page. I am not able to log in to this page (using username or domain\username). I get an invalid login whenever I try.
I have not been able to enable "Forms Authentication" for the site because that option is not available - only anonymous, basic and windows authentication are availbe - only anonymous is enabled. I am not sure how to enable forms authentication if it is not available as an authenication method. The .NET framework Version is set to 4.0 for the website.
DavidR