Windows 7: Bitlocker Encryption Failed [Corrupted the Hard Disk]

I am new to seven forums.
I got this issue today and now need any body to help me.

I wanted to encrypt my Western Digital Portable 500 GB HDD so my data would be safe.
I turned on the Bitlocker for this hard disk and set the password.
After that it started Encrypting..

I knew that it will take a long time so i went to university for lecture.
When i came back the encryption dialouge was stuck at 12.4 %.



I kept waiting for some time but it wasn't working i pulled out the cable and inserted again...

I inserted the key and it unlocked with autorun dialogue and Encrypting Dialogue.
[Snap Attached]

Clicking on *Continue without Scanning* brings the my computer windows and it starts searching but doesn't open the harddisk.


All this happens everytime i plug back, i have lost access to my all data thats stored on that harddisk... In my system there iz only 80GB Sata Hard containing OS.

I have tried one thing.
chkdsk /r it worked for a while but on 4th stage it stopped.

Please Can you Guys help me ? i want it to complete the encryption or decrypt whatever it has encrypted or damaged

Please Help ME :'(