WINDOWS CANNOT BE INSTALLED ON THIS DISK. THE SELECTED DISK IS OF THE GPT PARTITION STYLE !!!

NOTE:- This will DELETE all your data from the hard disk. whole hard disk will be ERASED. Take backup of ur files to an external drive before u proceed. \\\Follow this link to Take backup from the hard disk without logged in to the system.(if u can't logged in to ur system b'coz of some problem)///

1. Turn off the PC, and put in the Windows installation DVD or USB key.


2. Boot the PC to the DVD or USB key in UEFI mode (change in BIOS ).


3. From inside Windows Setup, press Shift+F10 to open a command prompt window.


4. Open the diskpart tool: type and enter as below
   
   
   

   
   

   
   

   
   

   diskpart
   

   
   

   
   

   
   

   
   


5. Identify the drive to reformat: type and enter as below
   
   
   

   
   

   
   

   
   

   list disk
   

   
   

   
   

   
   

   
   


6. Select the drive, and reformat it: type and enter as below ( one by one )
   
   
   

   
   

   
   

   
   

   select disk <disk number>        ///eg:- select disk 0
   clean
   convert gpt
   exit
   

   
   

   
   

   
   

   
   


7. Close the command prompt window.


8. Continue the Windows Setup installation.


9. When choosing an installation type, select Custom. The drive will appear as a single area of unallocated space.


10. Select the unallocated space and click Next. Windows begins the installation.

 

//source: technet