My ASP.NET page where working fine on win 2000 then I upgraded to XP PRO and now the pages simply do not execute, everything is set up correctly I even reinstalled the .NET framework and IIS 5. Any ideas?search for the asp.net Dll and be sure it is installedCheck to see that your web server is configured for aspx extensions. Go to IIS viewer, select Default Web Site, right click and select Properties. Select the Home Directory tab and click the Configuration button. On the App Mappings tab see if aspx, ascx, etc. are in the Extension column. If not, then refer to this article:<BR><BR>http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q318465<BR><BR>Thank you for your help that article provided the solution. I think my initial installation was corrupt.