Thanks Niall, that worked ,but I am now stuck with deployment, not sure if any changes to be made to task sequence, I am getting command prompt with X:\ windows\system32 prompt after the installation completes, I exit out of it, system reboots and gets stuck in :Getting ready screen" for long time and then "Unattend.xml parse ..could not access panther etc.. failure" message pops and another message says installation incomplete and asks to reinstall again, (IE welcome page - false) which was an issue is fixed in 2013,not sure what the issue with 2013.. kindly help