vCenter New installation

Hi There,

I have setup a VM machine with Windows 2012 64 Bit Standard which is called vCenter on a Workgroup.  I am trying to install vCenter 5.5 but having a few problems. I have gone with custom install and installed vCenter Single Sign-on I then try and install vSphere Web Client but get the error:

Could not connect to vCenter Single Sign On. Make sure that the Lookup Service URL points correctly to the vCenter Single Sign On instance you installed. My lookup service url is https://192.168.25.90:7444/lookupservice/sdk when I click on this I get access to the https page but get:

<?xml version="1.0" encoding="UTF-8"?>

<soapenv:Envelopexmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/" xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">

<soapenv:Body><soapenv:Fault><faultcode>ServerFaultCode</faultcode><faultstring>Unexpected EOF in prolog at [row,col {unknown-source}]: [1,0]</faultstring><detail>

<RuntimeFaultFaultxsi:type="vim25:InvalidRequest" xmlns:vim25="urn:vim25" xmlns="urn:vim25"/></detail></soapenv:Fault></soapenv:Body></soapenv:Envelope>

Any help would be great.

Thanks.