HOW TO CREATE BOOTABLE USB :-

This is one of the best software for creating bootable usb drives.

-freeware
-supports all WinOS and sysLinux bootable media creation
-provides environment to test bootable usb disks

To make a Windows Vista/7/8/8.1 bootable usb, follow given steps :-

1.Install the setup.

2.Insert the usb which you want to make bootable.

3.Start the RMPrepare USB application.

4.The name of the usb will be shown on the top box(Drives option).

5.Select the appropriate USB if multiple options are shown.

6.In "4.File System and Overdrives", check on the box "NTFS" and tick on

    "Boot as HDD(C:2PTNS)".

7.Click on "6.Prepare Drive".

8.Now it will ask to run a command.Select yes.

9.After all the process is completed and control is on the RMPrepare window, check if the command

   completed successfully by looking on the right side of "Choose Source" button.

10.Last step is to copy all the items of the windows installation disk to the bootable usb.

Please note that after step 9,the usb is bootable and you can now copy any files on the usb whose 

boot file is managed by BOOTMGR(i.e. a file named 'bootmgr' is also included with the windows

installations file. Note that the bootable image created by AOMEI Backupper,discussed on previous

post, can also be mounted on the usb in a similar way as it contains 'bootmgr' file).

For making a Windows XP usb disk, you need to download a dll file namely NTLDR.dll from 

www.dll-files.com and then copy it to USB drive after making it bootable. To make an XP bootable

USB drive, you just need to select "XP/BartPE bootable[NTLDR]" in the "2.Bootloader Options" of 

RMPrepare USB and rest all the same as for Windows 8.

To download RMPrepare USB, click here.