@kiranbhat: Dropped the idea of installing Ubuntu. And I am not upgrading because then there would be only 1 OS, mine and my dad's, instead of my OS and my dad's OS.
now my disk space usage is like this :
*i.imgur.com/noTch.png
And I can't make a new partition...
The above problem is now solved. Will report back after installing Win 7 Ultimate
OK, need more help. Now I have some unallocated free space. What to do to make a bootable partition?
Also how to make it inaccessible from the current OS?
When I try to make a new partition, it comes as a logical drive. I need a primary partition to install windows 7. This is my 4th partition, and I do not plan on creating any more.