Hi,
I am using windows 7 home basic as operating system in my laptop but am not satisfied with that, so i have to install windows 7 ultimate instead of home basic. Please tell me that how to do this process?
Simply take the appropriate DVD (buy the upgrade version, not the full), put it in your DVD-ROM and when the wizard asks you if you want to upgrade, click yes 
Windows Anytime Upgrade. Just put in the correct CD-key and it does the rest. Don’t even need a DVD.
The same thing How you install Windows 7 Home on your Laptop. Insert your CD and follow the instruction on your screen.
Its a simple. Like windows 7 setup. Only change selected of 5 option in 1 option windows ultimate. First you select home basic but now you select Windows Ultimate.
There are two options to choose from during the Windows 7 installation process:
* Upgrade. This option replaces your current version of Windows with Windows 7, and keeps your files, settings, and programs in place on your computer.
* Custom. This option replaces your current version of Windows with Windows 7, but doesn’t preserve your files, settings, and programs. It’s sometimes referred to as a clean installation for that reason.
In this article you’ll find detailed instructions for installing Windows 7 and reinstalling Windows 7
Complete guide : http://windows.microsoft.com/en-US/windows7/Installing-and-reinstalling-Windows-7
Related thread : http://www.techyv.com/blog/installation-windows-7