Customizing the image
You may customize the image before running your reference task sequence. Customizations are done in many ways; some are script-based, some group policies, some are manual efforts, some are done in a tool known as Windows System Image Manager (WSIM), and others can be done with PowerShell scripts.
Checking out the customization documentation
The general caveats and principles of image customization are documented for Windows at this KB at http://support.microsoft.com/kb/973289 . The essential gist of this is that to customize the user profile of a future user of Windows 7 or 2008 R2, you must customize the default local user profile. When this is done, the settings in the default profile will become the settings of new user profiles on the system. Note that this is the only officially supported method of customizing the default user profile in Windows 7.
For Windows 8.x, things change somewhat. The steps are documented at http://technet.microsoft.com/en-us/library...