Here are the instructions for pre-formatting:
http://forum.notebookreview.com/acer/259738-acer-vista-reinstallation.html
Not been able to find the .iso file on the Acer site but there is an FTP download of it here (209MB)
Burn the image to CD then boot to it and it should carry out the preformatting of the new drive ready for the restore disks.
Assume as usual Acer haven't supplied any instructions at all ...?