Hi jyoti1987,

Please refer below links.

ASP.NET 4.0 has not been registered on the Web server. You need to manually configure your Web server

I was trying to do that only :

but again it was giving some error:

Start installing ASP.NET (4.0.30319.0).This option is not supported on this version of the operating system.  Administrators should instead install/uninstall ASP.NET 4.5 with IIS8 using the "Turn Windows Features On/Off" dialog,  the Server Manager management tool, or the dism.exe command line tool.  For more details please see http://go.microsoft.com/fwlink/?LinkID=216771.Finished installing ASP.NET (4.0.30319.0).

Hi,

It may be the problem of ASP.Net not enabled on your machine.

Go to Control Panel, On Left side, Select Turn Windows features on or off, and select ASP.Net and some other features that need to be enable for .net environment.

OR to get it working just try any of these. To install or uninstall ASP.NET 4.5 on Windows 8 or Windows Server 2012, use one of the following options:

Run the following command from an administrative command prompt: dism /online /enable-feature /featurename:IIS-ASPNET45

For Windows 8 client computers, turn on "IIS-ASPNET45" in "Turn Windows Features On/Off" under "Internet Information Services-> World Wide Web Services -> Application Development Features -> ASP.NET 4.5".

For more details refer below link.

https://support.microsoft.com/en-us/help/2736284/how-to-install-asp-net-4-5-on-windows-8-and-windows-server-2012