Yesterday I reformatted my hard disk. Installed Win XP SP2. After that I installed some softwares. I then it installed Windows Vista Ultimate. Both operating system were working fine. But after installing vista sp1, win xp disappeared from the boot screen. I then used Easy BCD 1.7.2 and downloaded NDETECT and ntldr. And copied them to the drive where I installed XP. And used easyBCD to make a new entry in the boot screen for win xp. Now when I select XP in the boot screen it shows Boot.ini missing NTDETECT Failed. Any body knows how to solve this. I am really confused. PLZZZZZZZZZZZZZZ Help