Web Client Error

Hi I am getting following error while installing Web Client :

Could not contact Lookup Service. Please check VM_ssoreg.log in system temporary folder for details. (Screen Shot attached)

My VSphere Lab Configration is as follow

DNS (Win 2008 Server Ent 64 Bit) : 192.168.136.6

SSO + Inv Service + VC Server (Win 2008 Server Ent 64 Bit) : 192.168.136.16

Web Client (Win 2008 Server Ent 64 Bit) : 192.168.136.8

I used this ISO to install : VMware-VIMSetup-all-5.1.0-880471

Please help.

Regards

Ashish