I ended up in the same problem, but my experience is that the diskpart command doesn't insert the boot code into the MBR. That it leaves for the setup program. I was using Win PE to create a primary partition on a disk, acitvate, assign it. Then formatted using format C: /fs:ntfs. Lastly copying in a Windows Embeded XP installation to C:. Would not boot, just booted to a black screen without any errors, hanging around So it seems that diskpart does not insert the bootcode into the MBR, just defines the partitions. fdisk /mbr wont work since it is a DOS (heaven forbid) utility. I found some info on the Internet and set out to make my own utility to write boot code into the MBR. Was finished after a few hours, yesterday. The utility is written for Win PE, and is tested in Win XP and Win PE. Should work with any version above NT 4.0, including W2K, Win 2003, XP. Commands: MbrFix /drive <num> driveinfo Display drive information MbrFix /drive <num> listpartitions Display partition information MbrFix /drive <num> savembr <file> Save MBR and partitions to file MbrFix /drive <num> restorembr <file> Restore MBR and partitions from file MbrFix /drive <num> fixmbr Update MBR code to W2K/XP/2003 MbrFix /drive <num> clean Delete partitions in MBR MbrFix /drive <num> readsignature {/byte} Read disk signature from MBR MbrFix /drive <num> generatesignature Generate disk signature in MBR MbrFix /drive <num> writesignature hex Write disk signature to MBR MbrFix /drive <num> readstate Read state from byte 0x1b0 in MBR MbrFix /drive <num> writestate <state> Write state to byte 0x1b0 in MBR MbrFix /drive <num> drivesize Returns drive size in MB as return value MbrFix volumeinformation driveletter Get volume information for partition fixmbr is the command to run. It do keep the partition table, so any partitions should stay! The readstate and writestate commands are meant to have a place to store a status number between 0 and 255, if you have no other place to store it during the installation phase. The state is stored in a byte not used for other purposes in the MBR. Se the htm file in the zip-file. Use at your own risk 3. december: Uploaded a new version of the program, which doesn't popup the HTML documentation everytime one make a typo. No functional changes! 9. september 2005: Uploaded a new version of the program. A couple of new commands, no other changes. About 1470 had downloaded the previous version! MbrFix.zip