UEFI Windows 7 64Bits installation using a USB drive

METHOD 1:

Using third-party freeware - ISO2Disc

Step 1: Download and install ISO2Dis

Step 2: Launch ISO2Disc. Click on the Browse button and select your 64-bit Windows 8.1 ISO file.
You can also select Windows 7 (64-bit) ISO file or Windows 8 (64-bit) ISO file as your demand.

Step 3: Select the Burn to USB Flash Drive option.

Step 4: Select your USB drive from the list.

Step 5: In the Partition Style list: select GPT

Step 6: Click on the Start Burn button.

And wait several minutes for the burning procedure to be complete then you will have a UEFI bootable USB to install Windows 8.1.

METHOD 2:

Using third-party freeware - Rufus

Step 1:Download at the official site: http://rufus.akeo.ie/

Step 2: Run Rufus and click Yes if prompted by the User Account Control

Step 3: Select the settings as:
• Device: select your USB flash drive
• Partition scheme and target system type: select GPT partition scheme for UEFI computer
• File system: select FAT32
• Cluster size: select Default
• Format Options:
o Quick format: checked
o Create a bootable disk using: select ISO Image then click on icon and select your ISO file.
o Create extended label and icon files: checked
• New volume label: enter your desired label for the USB flash drive or leave the default name.

Step 4: Click on the Start button then click on OK to confirm the warning.
The program will now start copying the ISO file to make your bootable UEFI USB flash drive.

METHOD 3:

Using Microsoft’s Diskpart - a command-line hard disk partitioning utility.

Step 1: Open a Command Prompt with Administrator privileges in Windows 7 or Windows 8 or Windows 8.1.

Step 2: Type in these below commands then press Enter:
diskpart
list disk 
select disk X (caution: replace X with your target USB drive, in my case it is disk 2)
clean
create partition primary
format fs=fat32 quick
active
assign
list volume
exit

Step 3: Copy all files and folders in the ISO or DVD onto the newly created UEFI boot USB flash drive.
(if you are creating a UEFI bootable USB flash drive for installing Windows 7, please continue with step 4. If not, go to step 5)

There’re many ways to copy files in an ISO to USB flash drive:
#1 - If you’re using Windows 8/ Windows 8.1:
• Navigate to the folder that contains your ISO file.
• Right-click on the ISO file > select Mount.

If the issue is still not fixed, it can be a very critical problem with your computer affecting your personal data and the Windows Operating System. You will have to chat with our Experts or you can check with your local technician to get the problems fixed with very high priority.