Here is a history: There is this laptop PC HP Compaq 6720s (bios v. 1.2d), which was preinstalled with Vista. Now, the user decided to wipe the harddrive using bios utility to wipe all data from harddrive, in order to install windows XP instead. Trouble is, after trying to install XP it cant be initialized. This because every time you try this, the computer still tires to start from HDD, even tho if made to boot from either usb HDD or optical drives. now as a compromise i installed PART PE in the drive (using usb to sata wires), but get BOOTMGR missing error instead. Regular fix to this would be to start computer using the windows install cd, but as stated, BIOS rather launches only to the HDD. So i need instructions how to rebuild BOOTMGR on the drive without using optical drive of the laptop. Is there any way i can do this, without plugging the hdd to my own computer and disconnecting everything on it in order to repair this? end result being, i could use part pe to install windows or installing windows xp other way around, i allready tried install via USB drive and optical, but current version of bios sucks in this.