permission issue when editing a page using SharePoint Designer

Question

Hello everyone,

I am using Search Server 2008 based on SharePoint Server 2007 Enterprise with Windows Server 2008 Enterprise.

I have tried the search function by using IE to access address http://, and everything is fine with search functions (e.g. I can search page content by keywords). Now I want to use SharePoint Designer to customize the page.

• But when I use SharePoint Designer to open http://, I met with warning that the site is protected by password;
• And when I use SharePoint Designer to open http:///default.aspx or http:///results.aspx, I met with warning that I have no permission to edit the page, and asking to open a readonly copy.

I am using administrator to login Windows. Why I do not have permission?

thanks in advance, George