Step 7 in a series of posts documenting the Microsoft SharePoint Foundation 2010 upgrade process on SBS 2008. This is based on the document:
Step 7 - Remove the default Web application in SharePoint Central Administration
Click Start | All programs | Microsoft SharePoint 2010 Products | SharePoint 2010 Central Administration.
Accept the UAC that appears
From under Application Management select Manage Web applications.
Click on the site SharePoint – 80
Select the pull down arrow under the Delete button on the ribbon
and select Delete Web Application
In the dialog that appears select Delete content databases = No.
Press the Delete button to continue.
Click OK to confirm.