googling "remove vista" ada banyak bro..
http://www.removevista.com/
http://www.istartedsomething.com/20060622/installing-and-uninstall-vista-beta-2-for-dual-boot-with-xp/

1. Boot your computer in to Windows XP.
2. Insert/Mount the Windows Vista installation DVD into your drive and close 
the menu that might open.
3. Go to “Start” and “Run”. Type in “X:\boot\bootsect.exe /nt52 ALL /force”
   (without quotes, and replacing X: with the drive letter of your Vista DVD).
4. Restart the computer, and you will notice the boot selection menu is gone.
5. Format the partition/drive where you had Vista installed.
6. Remove two files (Boot.BAK & Bootsect.BAK) on your XP drive’s root folder 
(C:), these were backup files of your previous bootloader, now no longer useful.

cheers^^
  balthazor[at]oprekpc.com
||||||||||||||||||||||||original message|||||||||||||||||||||||||>
Subject: [PCplus] Cara Uninstall Vista
Wednesday, July 11, 2007, 5:24:16 PM,
"andi_vonata" <[EMAIL PROTECTED]> wrote:

> Nanya lagee..
> Laptop adek ane diinstall Win XP sama Vista. nah sekarang dia maunya 
> tuh cuma pake XP aja,Vistanya diilangin (gak mau ribet milih2 os, 
> maklum cewek). Gimana caranya bro??
> FYI keduanya diinstall didrive yg terpisah..

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