It's OK I found the answer here:

[url]http://www.planetmy.com/blog/how-to-fixmbr-using-windows-vista-bootable-disk/[/url]

I'll repost if it doesn't work.

On Sun, 18 May 2008 17:36:21 +0100, Rob <f8YRm9@spambobDELETETHIS.net>
wrote:
[color=blue]
>I have a new Fujitsu-Siemens Esprimo laptop with OEM Vista Home Basic.
>I have not previously used Vista, but I have used most versions of
>Windows from 3.1 on. I installed Linux Ubuntu under a dual-boot with
>the GRUB menu installed by Ubuntu. I now want to remove the Linux and
>go back to the original direct boot into Vista.
>
>If I remove the Linux OS and the GRUB menu, Vista will not boot. (I
>know, I have already tried.) I will be able boot Vista using a utility
>called Supergrub, which, in the case of an XP, setup will also restore
>a Windows direct boot (option called "Fix Boot of Windows") but this
>option does not work with Vista..
>
>On my desktop, where I run XP, I can restore a single Windows boot
>either by using the Supergrub utility or by booting the OEM XP setup
>disk, running the text based "Repair" option and using the command
>"FIXMBR". But if I try to boot this setup disk in my laptop it asks
>for a password, which I do not have. The OEM Vista disk boots directly
>into Vista graphic setup.
>
>I Googled and found I can use something called bootrec.exe, but I have
>not been able to find it.
>
>TIA
>
>Rob[/color]