Need help getting AJAX to work, I've tried everything

Hello. I'm trying desperately to get ASP.NET AJAX to work in Visual Studio. I've done every solution I can find anywhere, and nothing seems to work. Its just error after error after can't find this assembly or can't find that assembly. I will explain what I have done so far, and paste some relevant code from my machine. PLEASE tell me what i'm doing wrong!

First, downloaded AJAX Extensions for ASP.NET from Microsuck. Installed fine.
Next, downloaded AJAX Futures (CTP), installed fine.
Then went in a modified my web.config, based on MSDN's recommendations for an AJAX Enabled CTP site. (Full web config, with any conn strings pasted below).
Then, added a reference to the AJAX dlls and the CTP dlls to the project (AJAXExtensionsToolbox.dll, Microsoft.Web.Preview.dll)
Then, added a register tag to the ajaxtoolkit on my master page, as recommended by MSDN. (<%@ Register Assembly="AjaxControlToolkit, Version=1.0.10123.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e" Namespace="AjaxControlToolkit" TagPrefix="ajaxtoolkit" %> )
Then created a test aspx page, and added the following code (as per the sample on the toolkit homepage:
<asp:Content ID="Content1" ContentPlaceHolderID="MainContent" runat="server">
    <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    <asp:DropDownList ID="DropDownList1" runat="server">
    <asp:ListItem Text="1" Value="1"></asp:ListItem>
    <asp:ListItem Text="2" Value="2"></asp:ListItem>
    </asp:DropDownList>
<ajaxToolkit:DropDownExtender runat="server" ID="DDE" TargetControlID="Label1" DropDownControlID="DropDownList1">
</ajaxToolkit:DropDownExtender>
</asp:Content>

Forget it, errors up the butt. I'll list some of them below, then copy and paste my full web config for the project. What the hell am I doing wrong? I've literally been at this for days now trying to get it to work.

Errors (from the VS compiler) :
from the web.config : about 37 errors of "Could not find schema information for ..." [fill in the blank]
from the master page (where the register tag is) : Error      38      Could not load file or assembly 'AjaxControlToolkit, Version=1.0.10123.0, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e' or one of its dependencies. The system cannot find the file specified.      C:\Users\Brian\Documents\Visual Studio 2005\Projects\DSC\Main.master      4

FULL WEB.CONFIG FILE :
<?xml version="1.0"?>
<configuration>
      <configSections>
            <sectionGroup name="system.web.extensions" type="System.Web.Configuration.SystemWebExtensionsSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
                  <sectionGroup name="scripting" type="System.Web.Configuration.ScriptingSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
                        <section name="scriptResourceHandler" type="System.Web.Configuration.ScriptingScriptResourceHandlerSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
                        <sectionGroup name="webServices" type="System.Web.Configuration.ScriptingWebServicesSectionGroup, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
                              <section name="jsonSerialization" type="System.Web.Configuration.ScriptingJsonSerializationSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="Everywhere"/>
                              <section name="profileService" type="System.Web.Configuration.ScriptingProfileServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
                              <section name="authenticationService" type="System.Web.Configuration.ScriptingAuthenticationServiceSection, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" requirePermission="false" allowDefinition="MachineToApplication"/>
                        </sectionGroup>
                  </sectionGroup>
            </sectionGroup>
      </configSections>
      <connectionStrings>
      </connectionStrings>
      <system.web>
            <pages validateRequest="false" enableEventValidation="false">
                  <controls>
                        <add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
        <add tagPrefix="asp" namespace="Microsoft.Web.Preview.UI" assembly="Microsoft.Web.Preview"/>
        <add tagPrefix="asp" namespace="Microsoft.Web.Preview.UI.Controls" assembly="Microsoft.Web.Preview"/>
      </controls>
            </pages>
            <!--
          Set compilation debug="true" to insert debugging
          symbols into the compiled page. Because this
          affects performance, set this value to true only
          during development.
    -->
            <httpRuntime maxRequestLength="308000" executionTimeout="600"/>
            <compilation debug="true">
                  <assemblies>
                        <add assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
                        <add assembly="System.Management, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Messaging, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Data.OracleClient, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.Configuration.Install, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Transactions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.EnterpriseServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Web.Services, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Xml, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
                        <add assembly="System.Drawing.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
                        <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/></assemblies>
      <buildProviders>
        <add extension="*.asbx" type="Microsoft.Web.Preview.Services.BridgeBuildProvider"/>
      </buildProviders>
            </compilation>
            <httpHandlers>
                  <remove verb="*" path="*.asmx"/>
                  <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
                  <add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
                  <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
      <add verb="GET,HEAD,POST" path="*.asbx" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>

    </httpHandlers>
            <httpModules>
                  <add name="ScriptModule" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
            </httpModules>
            <customErrors mode="Off">
            </customErrors>
      </system.web>
      <system.web.extensions>
            <scripting>
                  <webServices>
                        <!-- Uncomment this line to customize maxJsonLength and add a custom converter -->
                        <!--
      <jsonSerialization maxJsonLength="500">
        <converters>
          <add name="ConvertMe" type="Acme.SubAcme.ConvertMeTypeConverter"/>
        </converters>
      </jsonSerialization>
      -->
                        <!-- Uncomment this line to enable the authentication service. Include requireSSL="true" if appropriate. -->
                        <!--
        <authenticationService enabled="true" requireSSL = "true|false"/>
      -->
                        <!-- Uncomment these lines to enable the profile service. To allow profile properties to be retrieved
           and modified in ASP.NET AJAX applications, you need to add each property name to the readAccessProperties and
           writeAccessProperties attributes. -->
                        <!--
      <profileService enabled="true"
                      readAccessProperties="propertyname1,propertyname2"
                      writeAccessProperties="propertyname1,propertyname2" />
      -->
                  </webServices>
                  <!--
      <scriptResourceHandler enableCompression="true" enableCaching="true" />
      -->
            </scripting>
      </system.web.extensions>
      <system.webServer>
            <validation validateIntegratedModeConfiguration="false"/>
            <modules>
                  <add name="ScriptModule" preCondition="integratedMode" type="System.Web.Handlers.ScriptModule, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
            </modules>
            <handlers>
                  <remove name="WebServiceHandlerFactory-Integrated"/>
                  <add name="ScriptHandlerFactory" verb="*" path="*.asmx" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
                  <add name="ScriptHandlerFactoryAppServices" verb="*" path="*_AppService.axd" preCondition="integratedMode" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
                  <add name="ScriptResource" preCondition="integratedMode" verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
      <add name="ASBXHandler" verb="GET,HEAD,POST" path="*.asbx" preCondition="integratedMode"
           type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
    </handlers>
      </system.webServer>
      <appSettings>
      </appSettings>
</configuration>

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