if the recovery partition was formatted during win 7 64-bit installation, then it is lost. You need to contact Dell and buy the recovery DVDs for your laptop model.
Or find if friends or family members have the exact model and create the recovery DVDs from their computer.
sir i would like to know how can i recover my recovery partition from any exact model?
It will be great on your part if you provide me the details of the second way which you have provided.