Want to host my .NET 3.5 web application in IIS 4.0 framework

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.NET

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Hi,

I have a VB.NET web application developed in 3.5 framework. It is currently hosted in IIS 7.5 with 2.0 framework version. I am trying to host it with 4.0 application pool in IIS. But getting some internal error at page level.

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.


Detailed Error Information 


Module
IIS Web Core 

Notification
BeginRequest 

Handler
Not yet determined 

Error Code
0x800700b7 

Config Error
There is a duplicate 'system.web.extensions/scripting/scriptResourceHandler' section defined  

Config File
\\?\C:\inetpub\wwwroot\WCSNShareSetup\web.config 



Requested URL
http://localhost:80/WCSNShareSetup/UserMaintenance/wfrmLogin.aspx 

Physical Path
C:\inetpub\wwwroot\WCSNShareSetup\UserMaintenance\wfrmLogin.aspx 

Logon Method
Not yet determined 

Logon User
Not yet determined 



Config Source     5:       <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
    6:         <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" allowDefinition="MachineToApplication" />
    7:         <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

I tried updating the web.config file. But no luck :( Looking for some quick replies. TIA!

What I have tried:

1. Added following part in configuration section-
<configuration>
<startup>
<supportedruntime version="v2.0.50727">
<supportedruntime version="v4.0">



2. Changed compiler version from 2.0.0.0 to 4.0.0.0

<system.codedom>
<compilers>
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.VisualBasic.VBCodeProvider, System, Version=4.0.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089" warninglevel="4">
<provideroption name="CompilerVersion" value="v3.5">
<provideroption name="OptionInfer" value="true">
<provideroption name="WarnAsError" value="false">