Ahhh sorry for delay i tend not to log in much over the weekend and another apology for misreading the issue thought the image was amde on an xp machine initially and then attempted to transfer to a downgraded vista one. Ok so that change sthings immensley as it cant be an image issue.
instead of doing a roll back on the imaged machien with sysprep can you try running fixmbr from teh reovery console, it may be the boot record isnt being written properly, this should prove or disprove that theory
Sorry again for going in the wrong direction initially!