Step 1.) Boot from the Ubuntu Gnome Flash Drive.
When booted go to the application Gparted.
(Click on the dash icon and search for Gparted in the applications).
Gparted is the best and most simple partition editor available.
Step 2.)In Gparted right click on each partition and click on delete, till you have deleted all the partitons and have left only 1 single block of unallocated space( around 460 gb it will be).
Step 3.)Now you are ready to partition. Right Click on the unallocated space, select new.
Create your desired partitions by.
to create 30 gb ubuntu partition: right click on unallocated space then new.
size- 30720 mb
(rest all options as is)
size - 2048 mb
i suggest you allocate atleast 60 gb for windows 7
right click on left unallocated space,
size - as is is
after that click on the apply button in the menu bar to save the changes.
it will then write the partitions and display successful.
---end part 1---
partitioning is done.
Now you are ready to install the OS.
First install Windows.
Boot from the windows 7 DVD.
Click on install.
Then Custom install.
Here select your 60gb NTFS partiton that you have earlier created and install to it.
After successfully installing, reboot and see if windows 7 is working fine.
--end part 2--
Now that your windows is installed its time to install ubuntu.
Boot from the ubuntu gnome 13.04 usb
Click on the install option on the desktop.
When it comes to the option
"Install Ubuntu 13.04"
It would Display 2 options-
1. Install Ubuntu (automatic)
CHOOSE something else.
choosing it would bring you to the Gparted partition editor.
Here the swap partition will be detected automatically.
Right click on your 30 gb ext4 partiton, click on edit, and set mount point as /
Verify thats everthing is correct and click on install
If you have any problems let us know..