Are you sysprepping? Was the reference machine previously joined to the domain?
For your images, you should keep them pure - never capture a dirty image because it only causes problems. Pure means NEVER having been on the domain before, and as lean & clean as possible meaning not using old images to make new ones - keep your old images as backups, but build from scratch (installation media) every time - always delete old partitions and remake them, and capture new images.
At my old job, I would include month and year (not day) in my image names.