Why would an aspx file return 404 (“The page cannot be found”)

Question

Why when I access an aspx (e.g., http://www.example.com/foo.aspx - not the real site) through IE6 would I get a 404 Error (i.e., \"The page cannot be found\") in IIS6

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Answer 1

ALTERNATE SOLUTION (same error perhaps different cause).

I had installed Visual Studio 2008 Pro without SQL Express it, and it caused this same error. Reinstallation of VS2008 with sql express included seemed to have corrected the problem, or perhaps the install took other actions. I did try to register ASP.net numerous times prior but no luck however it is definitely the most probable cause Just posting my experience for those pulling their hair as I was..

Thanks