Check it
https://www-secure.symantec.com/connect/articles/how-perform-scripted-os-installation-using-altiris-deployment-solution-71
https://www-secure.symantec.com/connect/blogs/how-create-and-deploy-windows-7-images
https://www-secure.symantec.com/connect/articles/windows-7-migration-introduction
https://www-secure.symantec.com/connect/articles/windows-7-migration-step-2