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#11
You don't want the zip file version of GParted for sure! That's more for the advanced user to run from the drive not burn to disk as with the iso image. For saving the 7 installation already on and seeing that drive made bootable there's another option.
First to preserve the Vista drive plus still have the 7 mbr entries present for a dual boot simply unplug the host Vista drive and perform an upgrade repair install on 7 with that being the default boot device being the only hard drive plugged in.
Once 7 is up and running you replug the Vista drive and see that back as the default. The repair of 7 will still load up when selected at startup even while the second drive is now bootable. You have two sets of mbr entries as well as boot files for 7!
You haven't done anything else to the Vista drive(host) as far as any further changes while having repaired 7. The BCD Editor.exe file you can download separately can be used to set 7 as the default without losing the new 7 boot splash screen. System Tools - BCD Editor
If you already have the EasyBCD tool on then you already the 7 boot screen changed to the Vista. With this method both drives however are bootable on their own just as if you had originally performed a stand alone install for each.