Making 64 bit vista boot disk on a 32 bit xp ?

After the last vista 64 bit sp 2 update on my 64 bit pc, that pc wont boot anymore (what a surprise!).
So I want to do a system restore to a point before that last update, but cant find my repair disc and the original vista os-disc is useless at reparing.
On the net I found a 64 bit vista repair image at that I 'burned' to a usb-key using unetbootin-windows-357.exe.

The problem is that even the 64 bit pc can boot from an usb-device, it wont.

My hunch is that unetbootin is using a replica of the 32 bit xp system to make the MBR & bootsector on the usb-key.

So what I need is a way to make a 64-bit MBR & bootsector configuration on my 32 bit xp system.
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  1. Best answer
    I don't think you can do that. I know with nLite and vLite you need a 64-bit OS to make 64-bit boot disks. However, you could try this option before going any further:

    1) Boot the Vista disk and go to the repair menu. Choose the Command Prompt.

    2) Type

    bootrec.exe /fixmbr

    del C:\boot\bcd

    bootrec.exe /rebuildbcd

    If your bootloader is screwed this should fix it. It will repair the MBR and then delete and rebuild the BCD (which is pretty obvious from the commands actually ;)).
  2. Thank you Ill do that.
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