Step1: Create Bootable USB Drive:
Start PowerISO (v4.8 or newer version, download here).
Insert the USB drive you intend to boot from.
Choose the menu "Tools > Create Bootable USB Drive". The "Create Bootable USB Drive" dialog will popup. If you are using Windows Vista or Windows 7 / 8 operating system, you need confirm the UAC dialog to continue.
In "Create Bootable USB Drive" dialog, click "..." button to open the iso file of Windows 7 or Windows 8.
Select the correct USB drive from the "Destination USB Drive" list if multiple USB drives are connected to the computer.
Choose the proper writing method. "USB-HDD" is recommended.
Click "Start" button to start creating windows 7 / 8 bootable USB drive.
If no errors occurred in the above process, you should now be all set to setup Windows 7 / 8 from USB drive!
Step 2: Configuring the BIOS:
You should now reboot and go into the BIOS configuration to boot from USB. Instructions for doing so wildly from system to system, but generally entail the following:
Reboot the system.
While booting (before Windows starts loading), get into the BIOS configuration screen by hitting something like F1, F2, Delete or Escape. Hotkey instructions are generally provided on the screen.
Go to the section that contains your boot devices.
With your USB drive plugged in, the USB drive should be listed. If it isn’t, your system might not support booting from USB. Assuming that it is supported (as is the case with virtually all modern hardware), promote your USB drive to the primary boot device.
Exit from the BIOS configuration, saving all changes.
If you’re completely new to BIOS configuration, BIOS for Beginners over at Tom’s Hardware might be a good primer. Be aware though, that you can seriously screw up your system by providing incorrect settings!
Step 3: Booting and setup windows 7 / Windows 8 from USB drive:
Assuming that you properly configured your BIOS and your USB drive supports booting, Windows 7 / 8 setup should now load. Depending on the speed of your USB drive, this may take a while.
If it isn’t working, then double-check the following before making a scene:
Is your BIOS properly configured for booting from the USB device? (Is the USB device listed and does it have top priority?)
Have you correctly prepared the USB drive in step one? (Restart the procedure.)
Does your USB drive properly support being booted from? (Try another one!)
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http://www.poweriso.com/tutorials/how-to-make-winxp-bootable-usb-drive.htm .
Step2: Create Bootable USB Drive:
ISO to USB is a free and small software that can burn the ISO image file directly to the USB drives, these USB drives include USB flash drives, memory sticks and other USB storage devices, it also supports to create a bootable USB disk with Windows operating systems. Freeware.
Click the image to view full size screenshot.
DownloadThe software license is Freeware, feel free to use it, but do so at your own risk.
Get it from a file mirror
Burn ISO to USB disks with ease
The ISO image file is a popular image of the CD/DVD discs, an ISO file can include all the content on the disc, this software can easily burn these ISO files to a USB flash disk, makes it easy to carry and use. The program's interface is very simple, you only need select the ISO file you want to burn and the target USB drive, then click "Burn" button, an USB disk that includes all ISO image data will be created. There do not have any complicated settings, it is easy to use very much.
Bootable USB flash disks
This software currently only support Windows bootable disk, can work with both BOOTMGR and NTLDR boot mode, can create USB disk with FAT, FAT32, exFAT or NTFS file system. (When you are making a bootable USB disk, suggest you choose the FAT32 file system.)
This program have be tested with Win8/Win7 PE and WinXP PE bootable ISO image files, it can work fine, the generated USB disk can normally boot the computers. Only a small part of the machines can boot Win8/Win7, but can not boot WinXP, these machines will display "NTLDR is missing", for this problem there is no good solution currently.
If create bootable USB disk failed, sometimes the USB disk will be unusable, you can try the following steps to recover it:
Insert your USB disk.
(a) For Win8, press keyboard "Windows key" + X together to open the Quick Access Menu, select "Disk Management". (Or, from Windows 8.1, users can right-click on the Start button to bring up this quick access menu).
(b) For Win7/Vista, click "Start", and then click "Control Panel", in the "System and Security", click "Administrative Tools", and then double-click "Computer Management". In "Computer Management" console tree, expand "Storage", click "Disk Management".
(c) For WinXP, click "Start", and then click "Control Panel", in the "Performance and Maintenance", click "Administrative Tools", and then double-click "Computer Management". In "Computer Management" console tree, expand "Storage", click "Disk Management".
In "Disk Management", right-click your USB disk (unallocated space), and then click "New Simple Volume", the "New Simple Volume Wizard" should appear, step-by-step, that is all.
