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Rossco · #7 27-11-2010, 11:30 PM

Ntldr error Causes are
1. Computer is booting from a non-bootable source.
2. Computer hard disk drive is not properly setup in BIOS.
3. Corrupt NTLDR and/or NTDETECT.COM file.
4. Misconfiguration with the boot.ini file.
5. Attempting to upgrade from a Windows 95, 98, or ME computer that is using FAT32.
6. New hard disk drive being added.
7. Corrupt boot sector / master boot record.
8. Seriously corrupted version of Windows 2000 or Windows XP.
9. Loose or Faulty IDE/EIDE hard disk drive cable.

Bootmgr error repair:

Method 1: Repair the BCD store by using the Startup Repair option

You can use the Startup Repair option in the Windows Recovery Environment to repair the BCD store. To do this, follow these steps:
Put the Windows Vista installation disc in the disc drive, and then start the computer.
Press a key when you are prompted.
Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
Click Repair your computer.
Click the operating system that you want to repair, and then click Next.
In the System Recovery Options dialog box, click Startup Repair.
Restart the computer.

Method 2: Rebuild the BCD store by using the Bootrec.exe tool

If the previous method does not resolve the problem, you can rebuild the BCD store by using the Bootrec.exe tool in the Windows Recovery Environment. To do this, follow these steps:
Put the Windows Vista installation disc in the disc drive, and then start the computer.
Press a key when you are prompted.
Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
Click Repair your computer.
Click the operating system that you want to repair, and then click Next.
In the System Recovery Options dialog box, click Command Prompt.
Type Bootrec /RebuildBcd, and then press ENTER.
If the Bootrec.exe tool runs successfully, it presents you with an installation path of a Windows directory. To add the entry to the BCD store, type Yes. A confirmation message appears that indicates the entry was added successfully.
If the Bootrec.exe tool cannot locate any missing Windows installations, you must remove the BCD store, and then you must re-create it. To do this, type the following commands in the order in which they are presented. Press ENTER after each command.
Bcdedit /export C:\BCD_Backup
ren c:\boot\bcd bcd.old
Bootrec /rebuildbcd
Restart the computer.

Method 3: Rebuild the BCD store manually by using the Bcdedit.exe tool

If the previous method does not resolve the problem, you can rebuild the BCD store manually by using the Bcdedit.exe tool in the Windows Recovery Environment. To do this, follow these steps:
Put the Windows Vista installation disc in the disc drive, and then start the computer.
Press a key when you are prompted.
Select a language, a time, a currency, and a keyboard or another input method, and then click Next.
Click Repair your computer.
Click the operating system that you want to repair, and then click Next.
In the System Recovery Options dialog box, click Command Prompt.
Type the following command, and then press ENTER:
cd /d Partition:\Windows\System32
Note Partition represents the letter of the partition on which Windows Vista is installed. Typically, this is partition C.
Type the following command, and then press ENTER:
bcdedit /enum all
In the Windows Boot Loader section of the output from this command, note the GUID that is listed for resumeobject. You will use this GUID later.
Type the following command, and then press ENTER:
bcdedit -create {bootmgr} -d "Description"
Note Description represents the description for the new entry.
Type the following command, and then press ENTER:
bcdedit -set {bootmgr} device partition=Partition:
Note Partition represents the letter of the partition. Typically, the letter is C.
Type the following command, and then press ENTER:
bcdedit /displayorder {GUID}
Note GUID represents the GUID that you obtained in step 8.
Type the following command, and then press ENTER:
bcdedit /default {GUID}
Note GUID represents the GUID that you obtained in step 8.
Type the following command, and then press ENTER:
bcdedit /timeout Value
Note Value represents the time in seconds before the Windows Boot Manager selects the default entry that you created in step 12.
Restart the computer.