The best example that I've found is from devguru [devguru.com...]
This will probably work for you, which you could then use task scheduler to fire it off.
Simply create a text file called myscript.vbs (vbscript) and edit in notepad.
Set WshShell = WScript.CreateObject("WScript.Shell")
WshShell.Run "iexplore http://www.example.com", 9
WScript.Sleep 10000 ' Give ie some time to load
'Close the browser
You might also be able to use some jscript on the web page to close the window after a certain amount of time.
Is your site and database on a hosted server? If you have control over it, I would probably make a windows service or scheduled SQL job to do the same thing that your web page is doing.
[edited by: TheNige at 2:22 am (utc) on Mar. 15, 2007]