how to install windows OS over ubuntu ext3 system ?

Please give us some more infos about your hard disk partitions: open a terminal from the menu Applications → Accessories → Terminal and type:

sudo fdisk -l

( the system ask you a password give your user password, you will not see nothing when you type it, then press enter )

to get partition list and then copy and paste result here...

Disk /dev/sda: 250.0 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x498fa908

   Device Boot Start End Blocks Id System
/dev/sda1 * 1 3338 26812453+ 83 Linux
/dev/sda2 3339 30401 217383547+ f W95 Ext'd (LBA)
/dev/sda5 3826 10199 51199123+ 7 HPFS/NTFS
/dev/sda6 10200 16573 51199123+ 7 HPFS/NTFS
/dev/sda7 16574 23202 53247411 7 HPFS/NTFS
/dev/sda8 23203 30401 57825936 7 HPFS/NTFS
/dev/sda9 3340 3825 3903763+ 82 Linux swap / Solaris

Partition table entries are not in disk order

Khaled Golam Mortuza
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2009/8/15 marcobra (Marco Braida) <email address hidden>

> Your question #80065 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/80065
>
> Status: Open => Needs information
>
> marcobra (Marco Braida) requested for more information:
> Please give us some more infos about your hard disk partitions: open a
> terminal from the menu Applications → Accessories → Terminal and type:
>
> sudo fdisk -l
>
> ( the system ask you a password give your user password, you will not
> see nothing when you type it, then press enter )
>
> to get partition list and then copy and paste result here...
>
> --
> To answer this request for more information, you can either reply to
> this email or enter your reply at the following page:
> https://answers.launchpad.net/ubuntu/+question/80065
>
> You received this question notification because you are a direct
> subscriber of the question.
>

You already have an installed Windows or at least you have already NTFS Win partitions...

So to install a Win on a ext3 partition i think you need to install virtualbox-ose package in Ubuntu an then install Windows on a virtual pc created with Virtualbox.

Here already answered questions about VirtualBox https://answers.launchpad.net/ubuntu/+source/virtualbox-ose

Here some howto https://answers.launchpad.net/ubuntu/+source/virtualbox-ose/+question/76833