Make bootable pendrive/portable drive
Now a days we can create a bootable as pendrive and can easily install the OS on our systems. Below is the process.
Order of Execution of Commands follows here :-
Run CMD as Administrator
SELECT DISK 2 [Number of your portable drive]
CREATE PARTITION PRIMARY
SELECT PARTITION 1
FORMAT FS=NTFS or Format FS=NTFS quick (For Quick Format)
I: [Your source drive containing Windows 7 DVD content]
BOOTSECT.EXE /NT60 K: [Your destination drive, portable device]
After all these commands just copy all the content in the windows 7 OS folder to Portable/Pen Drive . .