Thank you both

I have 2 hard drives, a wd and a samsung (both 160gb satas). Vista and Mac are on the wd, the samsung is for my data.
Ahci - not sure
MBR I believe
I have now set OSX to the active partition, and am using chameleon 2 to load vista which works. (how can i set vista as the default boot option for chameleon?)

The error when I try to startup my install is


http://www.bilderhoster.net/safeforbilder/7n6axhnl.png
Could you show me what to select using the above image?