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Install Windows From A Partition Without Any External Media

•  A Windows CD for first time only(with which you want to format or install your OS)
• EasyBCD Software(You can download free beta version of it from anywhere)
• Free Hard Disk space depending upon the size of your installation disc(for example here we gonna show you this process with Windows 7 and 8. Generally the size of a Windows 7-8 installation Disc is about 4 GB. So here we need 5 GB of free space. Thats means 1 GB more space than the installation disc)

Method :

1. Create a partition of about 5 GB. [As you can see in picture (Drive H:)]

   Blank Drive

2. Now open and copy your Windows 8 installation disc into this drive.

   Copy OS
3.  Now run EasyBCD and click on Add New Entry from the left side of the application.

   Add New Entry

4. Now click on WinPE

   WinPE

5. Now you have to path boot.wim file from the drive where youve copied your Installation Disc (Here Drive H:). To do this click on path(as you can see in pic) now open Drive H:, go to folder "sources and select the boot.wim file. 

   Select Path

   boot.wim

6. Now change the Entry name as Windows Installation or whatever you want. 

   Entry Name

7. Now click on Add Entry

   Add Entry

8. Finish :).. Now restart your PC.. And After booting youll be asked for select Windows. Here click on Windows Installation(the Entry you have just created) to go to Windows Setup. And you can continue Windows Installation.

Note: You can view the Entry setting or change Start Up setting or time to select the default operating system. To do this follow the steps given below.

Steps:
1. Click on My Computer properties and open.

My Computer Properties

2. Click on Advance system setting.

Advance System Setting

3. In Advance tab Click on Startup and Recovery Setting.

Start up and Recovery Setting

4. Now select your default OS and time to display setting form here.

Start up and Recovery Setting