Thanks for the response, I created a Task sequence to deploy an application (Symantec Enterprise Vault Client) and it fails with the same error however I can deploy the same program as an advertised application. So it seems to be with running Task Sequences within Windows, that is either Windows XP x86 and also WIn7 x64
****Update to the processes. I alterred the Collection Membership to specifically address the PC in question and not an AD security group the logged on user was a member of and it ran the Task Sequence, currently deploying the image, will post if this is 100% successful.