Recently I had a problem installing windows OS in my HP laptop. My laptop does not have CD ROM so I made my USB bootable with the help of Rufus software. You can click to download it.

But I couldn’t install windows. After certain steps of installing OS I reached to step where we can format and partition the hardisk. There I saw a message saying “Windows cannot be installed to this disk. The selected disk is not of the GPT partition style”. After some research I found that my laptop is booted in UEFI mode, but hard drive is not configured for UEFI mode.

So these are 2 options you can choose any to sort out this issue.
1. You can use “Rufus” to create a Windows Bootable USB drive for UEFI BIOS system and then install windows wihtout removing anything.

OR

2. You can remove all the partitions and convert your disk back to MBR partition style.

Method 1 :

Steps

1. Open Rufus software and insert USB.
2. choose partition scheme to GPT partition.(file system will automatically change to FAT32).
3. choose iso file and start making usb bootable.
4. change boot device priority to boot from USB first and make sure to use the UEFI Boot mode in BIOS.
5. restart the laptop/pc and install windows.

Method 2 :

Steps

If you want to go with your regular windows bootable USB using legacy boot mode option then you have to remove all the partitions and then convert your disc back to MBR partition style.

Note: Boot mode must be Legacy.

1. Restart the pc. In windows setup press “Shift + F10” to start command prompt.
2. Enter the following command in order.

• diskpart[Enter]
• list disk[Enter]
• select disk 0[Enter]
• clean[Enter]
• exit

close the command prompt and again restart the pc.
3. All the partitions are removed and now you can create partitions as your wish and continue setup.