You're doing this all wrong. Clonezilla is a very poor Ghost clone (sorry for the pun) and Symantec doesn't even sell Ghost anymore, so that should give you a clue as to how outdated this 'disk cloning' approach is. See: http://mdtguy.wordpress.com/2013/06/13/clonezilla-is-a-joke-and-a-bad-one-at-that/
So there's two options here:
Using the PersistAllDeviceInstalls and copyprofile settings you could set the unattended.xml file to tell sysprep to persist all drivers and settings (not recommended). This puts you in the business of building an image for every make and model you support (pain in the ass). Copy profile is good, persist drivers? not so good. See below.
USE MDT 2013 instead. It's free AND actually written by Microsoft (the people who wrote the OS)
- Download and install ADK 8.1 (yes, it works for Win7)
- Download and install MDT 2013 (yes, it also works for Win7)
- Create a share for building the reference image in the MDT workbench.
- Import the .wim file for Win7 from the ISO
- Create a build image task sequence (enable windows updates if you like)
- Update share and using a VM, boot to WinPE image it creates in boot folder
- Build your reference image in a VM (this way you have a driverless image)
- Capture your image (MDT will do the sysprep for you.)
- Build a second share in MDT for deploying this image.
- Create a deploy image task sequence.
- Load your drivers into this share using the "total control" method taught by Johan Arwidmark
- MDT will inject drivers at deploy time.
A more thorough guide can be found here: http://mdtguy.wordpress.com/getting-started/
I know this seems like overkill, but it has several key advantages, one of which is you have a hardware agnostic image that runs on all makes and models.
MDT will also name systems for you, update the images and install java, flash, firefox, whatever and finally join to the domain for you.
Clonezilla is a bad, bad choice if you're trying to roll out windows 7. Don't try to be a hero and reinvent the wheel here, the new MS Deployment tools are money, they just take some work to get up and running but are worth the time.