Boot the Ubuntu Desktop CD or another LiveCD.
Then mount the windows partition using the following commands:
Replace sda1 with the appropriate device (a = disk, 1 = partition number)
Then mount the virtual disk therein by entering the following command:
Now the content of the virtual disk will be visible under /vdisk.
7.04 users will have to install ntfs-3g first and specify it as fstype to gain r/w access.
To check the filesystem you can use, enter the following commands:
sudo fsck /win/ubuntu/disks/root.disk
Note:Make sure the root.disk is not mounted while entering the following command.
Using sudo command, asks you to enter the password.