Boot Configuration is corrupt Error Code = 0 x 490

Vista does not do a Repair Install by Booting from the DVD.

Repair Install has to be done from a running Vista, which you do not have.

Save ALL Data 1st and read below:

How to obtain Vista Recovery Media and/or use the Vista Recovery Partition on your Computer to put it back to Factory Settings.

There is no legal free Vista download available.

Contact your Computer Manufacturer and ask them to send you a set of Vista Recovery disk/s.

They normally do that for a small $ cost.

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Also, ask them if you have a Recovery Partition on your Computer/Laptop to restore it to Factory settings.

See if a Manual came with the computer, or go to the Manufacturer's website, email or phone them for info on how to do a Recovery.

Normally, you would press F10 or F11 at Startup to commence the Recovery Process.. 

Another way I have seen on some models is to tap F8, and go to a list of Startup options, and start a Factory Standards Recovery from in there, by selecting the Repair computer option.

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Also ask them if it is possible to make Recovery Disk/s from the Recovery Partition in case of Hard Drive failure or System Crash.

They will tell you how to do that.

Each Computer Manufacturer has their own way of making Recovery Disk/s.

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Or borrow a proper Microsoft Vista DVD (not Dell, HP, Acer, etc Recovery Disk/s).
A proper Vista DVD contains all Vista versions.
The Product Key determines which Vista version gets installed.

There are 2 Vista disks: one for 32bit Operating System, and one for 64bit Operating System.

If a clean install is required with a proper Vista DVD (not HP, Dell Recovery Disks):

At startup/power on you should see at the bottom of the screen either F2 or DELETE, to go into Bios/Setup, or F12 for the Boot Menu

Go into your Bios/Setup, or Boot Menu, at startup, and change the Boot Order to make the DVD/CD drive 1st in the Boot Order, then reboot with the disk in the Drive.

http://support.microsoft.com/default.aspx/kb/918884

MS advice on doing clean install.

http://www.theeldergeekvista.com/vista_clean_installation.htm

A Tutorial on doing a clean install

http://www.winsupersite.com/showcase/winvista_install_03.asp

Windows Vista Installation Super Guide

After installation >Go to your Laptop/Computer Manufacturer's website > Drivers and Downloads Section > Key in your Model number > Look for latest Vista Drivers for it > Download/install them.

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Data Recovery:

1. Slave your Hard Drive in another computer, and read/save your Data from there.

2. Put your Hard drive in a USB Hard Drive Enclosure, plug into another computer, and read/save from there.

3. Or, use Knoppix Live CD to recover your Data:

http://www.knopper.net/knoppix/index-en.html

Download/Save the above Knoppix Live CD ISO file.

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http://isorecorder.alexfeinman.com/isorecorder.htm

Download the Vista Burning software from the above link.

After installing above ISO burning software, right-click on Knoppix ISO file > Copy Image to CD.

Knoppix does not install on your PC; just uses your PC's resources, RAM, Graphics, etc.

Change the Boot Order in YOUR computer/laptop to make the CD/DVD Drive 1^st in the Boot Order.

Plug in a Flash Drive/Memory Stick, BOOT with the Live CD, and you should be able to read your Hard Drive.

When the desktop loads, you will see at least two hard drive icons on the desktop (one for your hard drive and one for the USB drive).

Click on the hard drive icons to open them up and figure out which drive is which.

Right-click the USB drive icon and choose "Actions > Change read/write mode" so you can write to the drive (it's read-only by default for security reasons).

Now find the files you want to back up and drag and drop them to the USB drive. When you are finished, shut down the system and remove the USB drive.

Cheers.