I have an Acer A0751h - came with Vista home basic.... I formatted C:\ then Clean installed Windows 7.
The hidden partition is still there, it is still functional - if I select it. It can be found under My Computer\manage\Disk Magement. It is hidden. The original Restore partition on all my Acer AOA 110s - AOA150s are all intact, and I have Clean installed Windows 7 on every one.