Norton Ghost or Symantec Ghost?
What version are you using?
You need to have an image to be able to install it - so what am I missing from your posting?
The simple answer is Yes - you can deploy windows 7 images using Ghost, but there are licensing issues you need to consider as well, as Windows 7 will automatically de-activate if deployed on a different machine to the one the image was created on. This is a Microsoft anti piracy measure.