If your install is on a separate drive you should be able to set boot order in your BIOS or by pressing the function key associate with boot order on startup.

If you install is on a partition you have two options.

1. Boot using the rd=diskXsY option where X is the disk number (starting with 0) and Y is the partition.

2. Boot using the partitions UUID (boot-uuid=F2E496ED-4FB6-3277-B24B-92B648D6006E)

Both of these can be found by booting the install disk, opening Disk Utility and selecting Information on the partition you installed to.

You use these commands at the Darwin prompt. Most likely since you go straight to Vista you do not get the prompt. You can instead boot the Install disk but when the Darwin prompt comes up you may use the commands.

Should look something like this. Ive added -v Verbose mode option as you should be using this every time you boot.

-v rd-disk0s1

-v boot-uuid=F2E496ED-4FB6-3277-B24B-92B648D6006E

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