Not sure quite what it is you want to do.
1. If you boot off the recovery partition - you should get the options to return that 1st HD to factory condition - i.e. with Vista on just as you received it.
be able to boot the recovery partition by marking it Active. Make sure you have a bootablle partition manager - in case in doesn't work and you need to mark Vista active again.
There is free downloadable .iso of GParted here: SourceForge.net: GParted: Files GParted -- Download
The Vista partition is Marked as System - that means it contains 7 boot management files.
If you restore Vista to factory condition - you need to then Run startup repair from the 7 dvd to add it back as a boot option.
2. If you wish to delete the Vista partition - you need to Make 7 into the System partition , and make the 7 HD the boot drive( the first drive in bios HD boot order).
You also need to add the 7 compatible bootsector code and MBR to the 7 HD.
Don't worry, it is easier than it sounds.
Unfortunately, in your case, the 7 HD is an extended partition - you can't mark it active and make it the System partition, unless you convert it to a Primary partition first.