Requirements -

1) Windows Vista/7 DVD 0r installation source (setup backup files)

2) A 4GB USB 2.0 Storage device (Its recommended to use USB 2.0 device for optimal performance)



Steps -

1. Plug your USB storage device. and run CMD and execute the following commands one by one.

Diskpart Run Disk partition utility

List disk To get disk index that is used to perform disk partitioning.

Select disk 1 Selects disk to perform disk partitioning.

Clean Flush your existing all USB drive’s partitions.

Create partition primary Creates a partition as primary partition.

Format recommended Format your USB drive with recommended parameters. (No need to worry about file system format)

If you have customized WIM image and its bigger than 4Gb than you’ll have to format your USB flash drive in NTFS file system, therefore the command would be: Format FS=NTFS

Active Set the partition as active to hold bootmgr.

Exit To quit Diskpart utility



2. Now copy all Windows Vista/7 files to USB storage device.

3. Boot your PC with it, you can install Windows Vista/7 via bootable USB storage device.
Note: If you face any trouble to boot with it or unable to boot, try this FIX.
I:\Boot\Bootsect.exe /NT60 I:
Where I: is the drive letter of USB storage device