Sreenu, try this "
Go to file manager on your phone
Go to settings and choose system folders,
In the System folder, find a file called mmcstore
Send the file to your PC using IR/Bluetooth
Open the file in Notepad
The password you need for your memory card is located within that file"
The other thing that might work for you is to "
1. Insert your card into your phone, without accessing it through the phone
2. Run FExplorer and Open the path C:\system
3. Find the file called mmcstore, and rename it mmcstore.txt
4. Copy that file (mmcstore.txt) to your PC and open it in Notepad
5. Your password will be located within that file. From here
One more thing you could try is to use a memory card read for your computer and format the cared through that. Hope this helps, good luck.
Hope this helps, good luck.