windows cannot be installed on this disk. The selected disk is of the GPT partition style. Windows 8.1

I have a ASUS R500A notebook.Original OS is Windows 7 64bit.Few days ago I tried to Install Windows 8.1 64 bit version.But it failed & error message is,

windows cannot be installed on this disk. The selected disk is of the GPT partition style.

My Steps:
First i Deleted C: Partition ( Already installed windows 7 ).
Then i Formatted that partition.
Tried to install Windows 8.1 64bit.

In this hard disk i have another several partitions with Important data.

How do i Install Windows 8.1 without loosing Data from the Other partitions ?

Solution 1:

This sounds like your Win7 was installed with EFI-support enabled but your Win8.1 installation is booted using CSM (Compatibility Support Module), which fakes a BIOS and Win8.1 subsequently thinks it's bootet on a BIOS system, which requires installation on an MBR-style disk.

Try deactivating the CSM in your EFI settings (something like Boot Mode: UEFI only), that should avoid this issue.

Solution 2:

If you have Windows 7 installation CD then Follow the steps bellow..

Boot Windows 7 DVD, click Repair your computer when you see this screen:

Then select Command Prompt..

In command prompt type diskpart to enter the utility.

1. Type select disk # replacing "#" with the drive number of the one you wish to format. To see a list of disks, type list disk.

2. Type clean. This deletes all volumes from the drive.

3. Type convert mbr to convert the disk to mbr.

4. convert gpt to revert back to GPT. (Optional step)

Attribution : Mosses Source Here