Here is another possible reason for your problem.
When you start (create) a web application in VS2005 you have an option to
create it using IIS or the file system. I think by default it is the file
system. The file system option means that VS2005 will not create IIS vritual
folder for you and will use a small development web server to run your
application. In fact you don't need to have IIS installed at all. However it
is VS that starts this web server when you try to run the application.
Without VS there is no way you can see your web page.

After you are done developing your web application you need to deploy it on
IIS. I believe there are deployment tools in VS that helps you with this,
but what I usually do is to create a virtual folder in IIS set up a web
application for that folder and copy my files manually.

Keep in mind that you cannot open aspx page using files system path such as
file:///C:/Mes documents/ ...
This is because aspx pages needs to be processed by the asp.net runtime in
order to generate the final HTML that is going to be served to the browser.

HTH

I try to run the file regiis_aspx.exe. Then, I look for this file. But I
can't find it in my computer.
I work on Microsoft Windows Server 2003.

Hello Ignacio,
I found the file aspnet_regiis.exe in the French version and I run it with
the correct parameters. But I always have the same problem.
Could you help me more, please?
I don't know what to do
Thank you for your help
Good bye

Any particular question among the 2000+ previous postings?