WD Hard Drive 1 TB not recognized by Windows

Hi,
I am using a WD My Passport 1 TB External Hard Drive for the past 2 years. I have tried connecting my hard drive to my Laptop but it wont recognize it. The light comes on and there are soft noises from within but nothing happens. It shows as a local disk division but it does not show my name nor the capacity. The system hangs after connecting it. I have tried using the disk management system so that i could change the assigned letter but since it is not recognized by the system I cannot do anything.

I have replaced the hard drive twice because of technical issues. I live in the Asian Circle so I have 3 years warranty and i have 1 year left. Also the serial no. and the p/n no. is also unreadable, please suggest a way to retrieve that too.

I am using Windows 7 Pro with 2.5 GB RAM Intel Celeron processor.