Hi,
I'm sorry you've run into installation issues. Typically this error comes up when SharePoint is installed but the incorrect site is selected during the DBXL install. Since you're not using SharePoint, we can discard that. I wouldn't rule out an issue with the site, however. Do you have just the default site (port 80), is it https, any other sites? (these should show up in one of the first few screens of the DBXL installer) I see that the computer name above is Labserver.cos.comcor.org, so it would be interesting to also take a look at the first tab (in the tabbed view of the DBXL installer). You can attach screenshots via the Options tab when replying. Thank you for the additional info.