If I understand you correctly, you created a system image of the Windows installation but then made the mistake of formatting the partition which contained that image - - is that correct?
If yes, I reckon you're pretty well screwed.
However, you could try connecting that drive to a working PC, then use partition recovery software to see if it can recover that image (google partition recovery software, there's quite a few).
Failing that you'll have to re-install Windows from scratch.
In future keep your system image backed up to another location, I have mine backed up on four separate external hard drives. Just having one instance of it is not enough.