bcdedit is truly a cryptic and difficult command-line tool, some time ago I needed to copy a Vista boot entry and add some debug flags -- I could not get the job done with bcdedit.
I had to resort to a GUI tool,
EasyBCD
As a slightly related note, I noticed that the FreeBSD bootloader can boot Vista, I used the bootloader from CURRENT, not sure if the one from 6/7 is ``Vista Ready''.
Quote:
To truly run bcdedit with Administrator credentials requires cmd.exe also be explicitly run with Administrator credentials. Right click on the Command Prompt icon (Start | All Programs | Accessories | Command Prompt), or open the Start window and type cmd. When the search facility shows the application's icon, right click it and select Run as administrator from the local menu.
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Going to the run box (The `search' box in the start menu doubles as the run dialog) and pressing CTRL/ALT/ENTER will accomplish the same effect.
Note that does not work with Win+R, do'h!