DotNetNuke 4 Install

I've been trying to install this portal for the last 2 weeks. I've been receiving many errors during installation..... This is my latest error..... Any help will be appreciated... Thanks...



Server Error in '/DotNuke4/Website/Install' Application.


Configuration Error Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.

Parser Error Message: Could not load file or assembly 'DotNetNuke.HttpModules.UrlRewrite' or one of its dependencies. The system cannot find the file specified. (E:\web\webopensou1\htdocs\dotnuke4\website\web.config line 58)

Source Error:

Code:

Line 56:     <httpModules>
Line 57:       <!-- add name="Authentication" type="DotNetNuke.HttpModules.AuthenticationModule, DotNetNuke.HttpModules.Authentication" / -->
Line 58:       <add name="UrlRewrite" type="DotNetNuke.HttpModules.UrlRewriteModule, DotNetNuke.HttpModules.UrlRewrite"/>
Line 59:       <add name="Exception" type="DotNetNuke.HttpModules.ExceptionModule, DotNetNuke.HttpModules.Exception"/>
Line 60:       <add name="UsersOnline" type="DotNetNuke.HttpModules.UsersOnlineModule, DotNetNuke.HttpModules.UsersOnline"/>

Source File: E:\web\webopensou1\htdocs\dotnuke4\website\web.config Line: 58



Version Information:Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42 <!--
[ConfigurationErrorsException]: Could not load file or assembly 'DotNetNuke.HttpModules.UrlRewrite' or one of its dependencies. The system cannot find the file specified. (E:\web\webopensou1\htdocs\dotnuke4\website\web.config line 58) (E:\web\webopensou1\htdocs\dotnuke4\website\web.config line 58)
at System.Web.Configuration.HttpModuleAction.get_Entry()
at System.Web.Configuration.HttpModulesSection.CreateModules()
at System.Web.HttpApplication.InitModules()
at System.Web.HttpApplication.InitInternal(HttpContext context, HttpApplicationState state, MethodInfo[] handlers)
at System.Web.HttpApplicationFactory.GetNormalApplicationInstance(HttpContext context)
at System.Web.HttpApplicationFactory.GetApplicationInstance(HttpContext context)
at System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr)
--><!--
This error page might contain sensitive information because ASP.NET is configured to show verbose error messages using <customErrors mode="Off"/>. Consider using <customErrors mode="On"/> or <customErrors mode="RemoteOnly"/> in production environments.-->