C: is the boot partition. You need to get rid of it to kill XP.
There may be a way to move things around so that you prep the
change and do not have to repair startup, but it wouldn't be simple.
The way it's done is to repair Vista's startup with the Vista DVD.
If you can't figure out how to delete C:, download a boot disk
http://www.bootdisk.com/
and format C:, being very careful to respect Vista's partition -
don't format that. Then boot from the Vista DVD, find repair,
and tell it to repair startup. When the computer boots into Vista
you can use Disk Management to rearrange partitioning.
"Knud Rasmussen" <kr_net_brug@aars.dk> wrote in message news:u8LfuejcHHA.2316@TK2MSFTNGP04.phx.gbl...
>I have Windows XP on my C: drive and Vista on another dish, drive is called
> V:
>
> The Vista bootmanager works perfect.
>
> Now i would like to delete the XP on my C: drive and only use the Vista. How
> can I do that without damage Vista and the startup??
>
>