If your using Umbraco v.4.7 ,then I think you need to set the Application Pool to .net Framework v.4.

Hope this helps

Hi praveitym

My App Pool is of course set to v4.0.

I found the solution myself actually. I installede Service Pack 2, and the reinstalled umbraco. Apparently there are som web.config problems, which SP2 solves. Then the install showed up, with no errors.

But, i tried to install via Remote Desktop, but javascript or something was disabled, so the installer did not work proberly. Instead i wnet via the IP and everything worked like a charm! 

Errors are making you blind..

Anyway, thanks praveity.

I can't install Umbraco 4.6+ on win2008&IIS7.

the following is written in Chinese, hope it can give you help.

:
iis7
xx\xx\xxx\web.config
133
:"system.web.extensions",


Line number: 154 
Error: The configuration section 'system.web.extensions' cannot be read because it is missing a section declaratio
http://our.umbraco.org/forum/getting-started/installing-umbraco/10095-Umbraco-45-Dontnetpanel-Server-Error-systemwebextensions

IIS7
1..net 4.0
2..net4.0(>>>>)
3.“”Set the Manage Pipeline mode from Integrated to Classic
Run website on IIS7 (Vista) in classic mode
IIS



http://forums.asp.net/p/1547286/3784899.aspx
 

This is because config section hasn't declared. in 4.0 webconfig you have to add it manually.

<configSections>

    <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
      <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
          <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="Everywhere"/>
          <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
          <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
          <section name="roleService" type="System.Web.Configuration.ScriptingRoleServiceSection, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
        </sectionGroup>
      </sectionGroup>
    </sectionGroup>

</configSections>

--------
iis7

404

http 404.2 -not found
web"isapiCGI"
IsapiModule
ExecuteReauestHandler
:PageHandlerFactory-ISAPI-4.0_32bit
:0x800704ec


IIS  “ISAPICGI”.net4,

“”“”“”

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