When I create a breakpoint, on an ASPX.CS page, then press F5 I get a pop-up message that says "Unable to start debugging on the web server. Debugging failed because Windows authentication is not enabled. Please see help for assistance". Help was no help, so I uninstalled both .NET runtimes and VS.NET 2005, but after resinstall I still get this same error. Note that I am trying to debug a website that is hosted locally on my computer, not remotely on a server.