During my experiments with SharePoint 2010 I have deleted the default team site, so when I go to
http://computer_name I have "404 not found" error.
Now it is impossible to create/add any subsite sites because I would need to browse the parent site which does no longer exist. I cannot also use SharePoint designer - it would simply report the error:
This site must be created on a server that is running Microsoft SharePoint Foundation. Please choose another location.
What can I do to fix this?