previously my laptop was having two partition, C and D.  On C:\ i had windows 7 install.  I wanted to make a dual boot system with Elementary OS Freya.  Hence i made a separate 6 GB EXT3 partition from my D:\ and install Elementary OS on the Seperate partitionThe installation was successful.  I restarted the laptop and found both Windows 7 and Elementary OS options.  However when i selected Windows 7 it did not boot.  However elementary OS was working fine.  I want both the os to workWhile installing EOS, i was not connected to internet, nor i try to ran the update through the internet after the EOS installation was sucessfull.   
help needed with elementary OS dual boot with windows 7
boot
the above solution does not work.  i have finally formatted all the partitions, install elementary OS a fresh.  Now i am planning to install windows 7 as second OS.  Finding the tool to create a bootable USB so that i can create windows 7 bootable from Elementary OS 