Creating a windows 7 bootable pendrive .
Do all these steps :
1)open command prompt after inserting pendrive .
2) type DISKPART hit enter
3) then LIST DISK hit enter
4) then type SELECT DISK and put the number which ur pendrive has , for say 1 ... so type SELECT DISK 1 and hit enter .
5) now type CLEAN ...
6) CREATE PARTITION PRIMARY
7) SELECT PARTITION 1
8) ACTIVE
9) FORMAT FS=FAT32 QUICK
10)ASSIGN...
11) EXIT .
NOW COPY ALL WINDOWS 7 FILES IN PENDRIVE AND DONE :)