If your PC won't boot and you are unsure which option to select then selecting every option will usually resolve the problem. If you have moved your system partition to a different position or reset the Disk ID then you need to rebuild the BCD.
It isn't concerned with the numbering of the system partition but is dependant on the exact offset from the beginning of the disk and the Disk ID. Vista uses something called the Boot Configuration Data ( BCD) as a replacement for the boot.ini. In this case you may need to rebuild the boot.ini file to reflect this change. The system partition has now moved from partition 2 to partition 1. You restore to a new disk but don't restore the recovery partition as this is no-longer required. e.g, your original disk had a recovery partition as the first partition on disk and your system partition (drive c:) as the second. XP uses the boot.ini file and if you restore your system partition to a different partition number then this file needs to be rebuilt. Iv) Rebuild the BCD and BOOT.INI files: These files perform the last part of the boot process and tell Windows where to find the operating system, the '\windows\system32' folder. If this code has been damaged, perhaps due to a virus, then replacing it will allow Windows to boot normally. Iiii) Replace the partition boot sector code: The partition boot sector code is the second part of the boot process and is a small program that is added to the front of a partition when you format a file system. In this case, replacing with the standard Windows MBR will allow your PC to boot. It's also possible that your PC shipped with a non-standard MBR that doesn't work correctly with a new disk. You need to replace this if your MBR has become corrupted, perhaps with a virus. Ii) Replace the Master Boot Record: The Master Boot Record ( MBR) is the first part of the boot process and is a small program on the first 512 bytes of the disk. Note: if your O/S is Vista then you must rebuild the BCD (last option) if you reset the Disk ID.
If you reset the Disk ID then Windows will re-allocate drive letter assignments and will correctly set drive 'C' to be the active partition. If drive 'C' is now in a location where drive 'D' used to be then Windows may fail to boot. If you restore the system partition (Drive C:) to a different position on your disk then Windows can get driver letters 'mixed up'. It forms part of a unique identifier that Windows stores in the registry along with the offset from the beginning of the disk for the partition.
I) Reset the boot disk ID: The Disk ID is used by XP and Vista to allocate and remember driver letters and partitions.
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