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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 ?

TechGuy
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3 Answers3

14

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.

Andreas Wiese
  • 2,141
1

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:

enter image description here

Then select Command Prompt..

enter image description here

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

Community
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Ruban Savvy
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0

You need to boot using UEFI. Actually, your bootable DVD/USB Flash Drive should support UEFI boot.

Boot from DVD ROM

I guess Windows DVD ISO supports both UEFI boot and BOIS (legacy) boot, so if you are installing windows from a DVD-Drive, you should select a boot option that supports UEFI. You need to do it in the BOIS boot menu (by pressing F12 or F11 while booting the PC), or select it in the Boot page of the system BOIS (you may need to add required boot option).

Boot from USB Flash Drive

You need to create a bootable Flash drive using a tool that support UEFI boot. I highly recommend rufus, as it is the best utility for creating bootable USB Flash drives. Make sure that you select GPT partition scheme for UEFI in the second drop down menu ("Partition scheme and target system type"). You may also need to adjust the boot setting in the system BOIS (like what I said for DVD ROM)

For more information see:

Moha Dehghan
  • 161