To install windows seven with a USB device you need the Pen Drive or Some external device but its size should be atleast 4Gb. It also needs to be formatted during processing, so backup all the data on it.
:::: Method :1 ::::
Use this method if you have the ISO image of your windows setup.
just download the tool from This Link ,install it and and follow the simple steps. I prefer to create an ISO image by using free tools like IMGBurn and proceed with this method.
:::: Method : 2::::
Use this method if you dont have the ISO image of the setup and have a DVD of windows seven installation.
Step 1: Formatting your USB device1.> Plug in your USB Flash Drive
2.> Open a command prompt as administrator (Start >> All Programs >> Accessories >> Command Prompt and Right click to select “Run as administrator”
3.> Find the drive number of your USB Device by typing the following into the Command Prompt window:
diskpart:-
list disk
The number of your USB drive will listed. You’ll need this in the next step. Here assume that the USB flash drive is disk 1.
4.> Format the drive by typing the next instructions into the same window. Replace the number “1” with the number of your disk below.
select disk 1
clean
create partition primary
select partition 1
active
format fs=NTFS
assign
exit
Step 2: To Make the USB Device Bootable
Next we’ll use the bootsect utility that comes on the Vista or Windows 7 disk to make the flash drive bootable. In the same command window that you were using in Step 1:
1.> Insert your Windows Vista / 7 DVD into your drive.
2.> Change directory to the DVD’s boot directory where bootsect lives:
d:
cd d:\boot
3.> Use bootsect to set the USB as a bootable NTFS drive prepared for a Vista/Win7 image. Here assuming that your USB flash drive has been labeled disk E:\ by the computer:
bootsect /nt60 e:
4.> Now close the command prompt window.
Step 3: Copy the installation DVD files in the USB drive
Now just simply copy all the files from the DVD to your USB device.
Step 4: Set your BIOS to boot from USB
This is where you’re on your own since every computer is different. Most BIOS’s allow you to hit a key at boot and select a boot option.
If You Have Any Questions, Feel Free To Post A Comment