1. Press WIN + R;

2. Enter DISKPART

3. Enter following command (The attached picture is for yourreference.):

         a. listdisk                   // check the connected disk

         b. sel disk x                // select the disk that you want to create (x is the disknumber)

         c.clean                       // clean the partition table

         d. create parpri        //Create a primary partition

         e. formatfs=fat32 label=”WINBOOT” quick       // Format the partition. The “Label” and “quick” option is notnecessary.

        f. active                       // make this partition Actived

4. Copy the install disc files to the created USB.

How to make a bootable[Win VISTA/7/8] USB flash Media