to Bleeping Computer.
So, if I understand correctly, you only want Windows to make an image of your C: partition and NOT your E: partition. Correct?
Well, unfortunately, Windows 7 does not let you pick the partitions that it makes a system image of. You can pick parts of any drive to back up as data, but it does the partition images automatically. It's not something you can customize.
You'll have to use a third-party program (like Ghost) if you want that level of customization. Sorry.