INSTALL WINDOW 7 OS USING VIRTUAL BOX

STEP 1 Open vitual box and create new 

STEP 2 Put name and  next  and create until it finish creating

STEP 3 After creating, click settings

STEP  4 Open storage

STEP  5 Click empty 

STEP  6 And choose a file disk

STEP  7 And find windows 7 ultimate

STEP  8 Click start 

 STEP 9:Choose your Windows Setup options. Once Windows Setup loads, you'll be presented with a window. Use the drop-down menus to select your preferred language, keyboard type, and time/currency format, then click Next in the lower-right corner.

STEP 10:Click the Install Now button. It's the blue button in the center of the screen.

STEP  11 Choose windows 7 ultimate

STEP 12:Accept the License Terms. Read over the Microsoft Software License Terms. Then click the checkbox next to I accept the license terms, and click Next in the lower-right corner.

STEP 13:Select the Custom installation. This option allows you to do a clean install of Windows 7. This will erase all your files on the installation drive.

• If you do not want to erase all your files, select Upgrade instead. This option requires an existing Windows installation. You can only upgrade from one Windows edition to another. For example, if you have Windows Vista Home Basic Edition, you can only upgrade to Windows 7 Home Basic Edition. You would not be able to upgrade to Windows 7 Home Premium.
  

  
  
  
  
  

STEP 14:Select a hard drive and partition you want to install Windows on. A hard drive is a physical part of your computer that stores data, and partitions "divide" hard drives into separate sections. Click the hard drive or partition you want to install Windows 7 on.

STEP 15:Install Windows on your preferred hard drive and partition. Once you've decided on where to install Windows, select it and click Next. Windows will begin installing. Your computer may start and restart several times during the installation process.