Use a program called EasyBCD. It's free and really easy to use. It helps you customize/rebuild your bootloader. Let me know if it helped or if you need help.

The drive letters are usually different when seen from Winre.

If you are editing bcd from within windows - use the drive letters as seen by the o/s you are currently booted into.

Your screenshot shows you are currently BOOTed into an o/s on Disk1 (C).

The System partition ( containing the boot critical files) is on Disk 2 (D)

How do you mean "boot from" E ?

I think your best bet is to make the Vista partition, both system and boot.

1. Go to folder options, make sure hidden files and protected o/s files are showing.

Copy and paste bootmgr and the pale yellow boot folder from D to C.

( You will get a message bcd is in use and can't be copied) skip it and copy the rest)

2. In Easybcd click Utilities , then Power Console ( same as cmd prompt)

TYPE : (press enter after each command)

bcdedit /export C:\Boot\bcd

bcdedit /set {bootmgr} device boot

bootsect.exe /nt60 all /force

mbrfix.exe /drive 1 fixmbr /vista /yes

3. In Disk Management, rt click C and mark it Active.

4. Restart - go into Bios and change the boot order so your Vista HD is the first in Bios boot order.