Thank you so much Bill for quick response,
Yes, you are absolutely right, By resetting client DecryptPassword errorgot resolved but I got a new error Invalid password.
I would like to inform you that, If I work as a administrator(my user with admin rights) then it works fine with out any error but when I try with out admin rights I get this error.
I guess, It's related to cryptography context and key container.
Help would be appreciated.
Thanks,
Sudhir