There are situations out there where you require a boot-able USB thumb drive.
This Instructable will guide you through the simple steps in making just about any USB thumb drive into a boot-able Windows Vista/7/8 installer.
1. A 4GB or larger USB thumb drive. (I recommend a 8GB thumb drive)
2. Latest version of YUMI. (Can be downloaded from here)
3. Windows install media. (Should be in ISO format)
4. Computer that requires Windows to be installed! (With or without DVD-ROM)