WCF Service works With Win 7 but not XP with wsHttpBinding

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WinXP

Windows

WCF

Binding

I made a web service that seemed to be working fine until i decided to use wsHttpBinding so that i could have the extra security. After changing the binding to wsHttpBinding everything continued to work on Win 7 clients but the Win XP clients are not working. Below is my web.config.

<pre lang="xml">
<?xml version="1.0"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
    <customErrors mode ="Off">
    </customErrors>
  </system.web>
  <system.serviceModel>
    <services>
      <service name="aim_wcf_service.NIM_Latency" behaviorConfiguration ="aim_wcf_service.Service1Behavior">
        <endpoint address="https://services.oscautomation.com/NIM_Latency.svc" binding="wsHttpBinding" bindingConfiguration="TransportSecurity" contract="aim_wcf_service.IService1"/>
        <endpoint address="mex" binding="mexHttpsBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <bindings>
      <wsHttpBinding>
        <binding name ="TransportSecurity">
          <security mode="Transport">
            <transport clientCredentialType="None"/>
          </security>
        </binding>
      </wsHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior name="aim_wcf_service.Service1Behavior">
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpsGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="false" />
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

</configuration>

if anyone has any ideas on what could be causing this or ways that i could research this further please let me know. Also if it matters this service is hosted in iis6.