Windows Automated Installation Kit is a smaller version of Windows that can be downloaded freely from the Microsoft website. Using this kit, you can boot Vista from a USB drive. Creating a bootable USB drive gives you a powerful portable troubleshooting, imaging and data recovery tool. If used for installation, your USB drive will be faster than a DVD or installing through your network. If you have a larger USB drive (two gigabytes or more) you can use it for storage or data transfer even with a bootable version of Windows on it.
Open your browser. Navigate on the Microsoft website to the page for "Windows Automated Installation Kit." Click "Continue" and download the "Windows Validation Tool" by clicking "Continue" under the "1. Run the Validation Tool" title. Open "GenuineCheck.exe" and wait for validation to complete. Download "Windows Automated Installation Kit."
Click "Start," then "All Programs," then "Accessories," then "Command Prompt." In Command Prompt, type "diskpart," then hit the "enter" key, then type "list disk" and press "enter." A list of drives will appear; usually there is only "disk 0" and "disk 1." In this case, type "select disk 1" and then press "enter." If there are more than two disks listed ensure that the "size" next to the disk you select corresponds to the size of your USB drive. When you find the correct disk, type "select disk 2/3/4" and hit enter. Type "clean" and press enter. Type "create partition primary" and press enter. Type "select partition 1" and press enter. Type "active" and press enter. Type "format fs=fat32" and press enter. Type "assign" and press enter. Type "exit" and press enter.
3.Click "Start," open All Programs, and open "Windows AIK." Click "Windows PE Tools Command Prompt." In this window, type "Run Copype.cmd x86 c:\winpe_x86."
Insert your USB disk into a USB port. Open "My Computer" and check which letter represents your USB drive; for example, "X." Click "Start," "All Programs," then "Accessories" and open "Command Prompt." Enter into Command Prompt:
xcopy c:\winpe_x86\iso\*.* /s /e /f X:\ (change X to whatever letter your flash disk is represented by on "My Computer" before pressing enter). Wait for the data to copy to your USB drive. Your USB drive can now be used to boot Windows Vista.