How to solve authentication login mixup after deploying at production server?

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C#

ASP.NET

Visual-Studio

I have a project that is using windows authentication method for user to login to the web application. My server is running IIS6. No matter which pc i am using, i will login to the same windows account instead of my pc username. What should i do? Here are the steps that i had done:

1. Create a new application pool
2. Create a new virtual directory and create the application
3. Direct my web application to the application pool
4. Enabled anonymous user
5. Identity impersonate set to true
6. Authentication set to windows

web.config code (full):

<?xml version="1.0"?>
    <!--
      For more information on how to configure your ASP.NET application, please visit
      http://go.microsoft.com/fwlink/?LinkId=169433
      -->
    <configuration>
        <appSettings>
            <add key="ChartImageHandler" value="storage=file;timeout=20;"/>
    	</appSettings>
        <connectionStrings>
    		<add name="Appraisal_System" connectionString="Data Source=database;Initial Catalog=mytable;User ID=uid; Password=passw"></add>
    	</connectionStrings>
    	<system.web>
      <httpHandlers>
       <add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
        validate="false" />
      </httpHandlers>
      <pages>
       <controls>
        <add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting"
         assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
       </controls>
      </pages>
      <compilation debug="true" targetFramework="4.0">
    			<assemblies>
    				<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    				<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    				<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    				<add assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    			</assemblies>
    		</compilation>
    		<httpRuntime enableKernelOutputCache="false"/>
    		<authentication mode="Windows"/>
    		<identity impersonate="true"/>
    		<membership>
    			<providers>
    				<clear/>
    				<add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/"/>
    			</providers>
    		</membership>
    		<profile>
    			<providers>
    				<clear/>
    				<add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
    			</providers>
    		</profile>
    		<roleManager enabled="false">
    			<providers>
    				<clear/>
    				<add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/"/>
    				<add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/"/>
    			</providers>
    		</roleManager>
    	</system.web>
    	<system.webServer>
    		<validation validateIntegratedModeConfiguration="false" />
    		<modules runAllManagedModulesForAllRequests="true" />
      <handlers>
       <remove name="ChartImageHandler" />
       <add name="ChartImageHandler" preCondition="integratedMode" verb="GET,HEAD,POST"
        path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
      </handlers>
     </system.webServer>
    </configuration>

things that i tried:

- changing the identity impersonate to false (but there's this security popup everytime and i cannt login)
- changing my code to response write and find the username of the pc (all displays e window acc that anonymous enabled)