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You may receive error message 0x490
when some hardware was faulty, pc freezing, blue screen and so on, this page contains some useful
repair your windows 7 (or other windows systems) error
code 0x490, if you fixed this error from this help article, please
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When you install updates on Windows 7 computer, it can't boot
and failed to find OS loader, you may get the error below:
"Failed. Error code = 0x490"
How to fix?
To resolve this no boot issue, try following steps:
To run the Bootrec.exe tool, you must start Windows RE,
1. Put the Windows Vista or Windows 7 installation disc
in the disc drive, and then start the computer.
2. Press a key when you are prompted.
3. Select a language, a time, a currency, a keyboard or
an input method, and then click Next.
4. Click Repair your computer.
5. Click the operating system that you want to repair,
and then click Next.
6. In the System Recovery Options dialog box,
click Command Prompt.
7. Type Bootrec.exe, and then press ENTER.
Note To start the computer from the Windows Vista or
Windows 7 DVD, the computer must be configured to start from the
DVD drive. For more information about how to configure the
computer to start from the DVD drive, see the documentation that
is included with the computer or contact the computer
The Bootrec.exe tool supports the following options. Use the
option that is appropriate for your situation.
Note If rebuilding the BCD does not resolve the startup
issue, you can export and delete the BCD, and then run this
option again. By doing this, you make sure that the BCD is
completely rebuilt. To do this, type the following commands at
the Windows RE command prompt:
> bcdedit /export C:\BCD_Backup
> cd boot
> attrib bcd -s -h -r
> ren c:\boot\bcd bcd.old
> bootrec /RebuildBcd
The /FixMbr option writes a Windows 7 or Windows
Vista-compatible MBR to the system partition. This option does
not overwrite the existing partition table. Use this option when
you must resolve MBR corruption issues, or when you have to remove non-standard
code from the MBR.
The /FixBoot option writes a new boot sector to the
system partition by using a boot sector that is compatible with
Windows Vista or Windows 7. Use this option if one of the
following conditions is true:
> The boot sector has been replaced with a
non-standard Windows Vista or Windows 7 boot sector.
> The boot sector is damaged.
> An earlier Windows operating system has
been installed after Windows Vista or Windows 7 was installed.
In this scenario, the computer starts by using Windows NT Loader
(NTLDR) instead of Windows Boot Manager (Bootmgr.exe).
The /ScanOs option scans all disks for installations that
are compatible with Windows Vista or Windows 7. Additionally,
this option displays the entries that are currently not in the
BCD store. Use this option when there are Windows Vista or
Windows 7 installations that the Boot Manager menu does not
The /RebuildBcd option scans all disks for installations
that are compatible with Windows Vista or Windows 7.
Additionally, this option lets you select the installations that
you want to add to the BCD store. Use this option when you must
completely rebuild the BCD.
After following the above i then ran the following from command
> bootrec /fixmbr
> bootrec /fixboot
This resolved the issue for me and allowed me to log on to the
PC in its previous working state.
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That is we find the informations to
fix error code 0x490 in windows 7, hope our page is helpful to
you, if you still need more guide detail, please contact the
microsoft support for further help.
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