Unable to generate key hashes for my android application

I am trying to generate a development key for my application using the link:

http://ift.tt/1a2LWiM

I have installed Open-SSL 0.9.8[x64] on my system, performed the restart as said but still i get the following error on Dos-prompt:

openssl is not recognized as an internal or external command, operable program or batch file."

I must tell you that this is the command that i am giving :

keytool -exportcert -alias androiddebugkey -keystore %HOMEPATH%\.android\debug.keystore | openssl sha1 -binary | openssl base64

My OpenSSL is installed in : C:\OpenSSL\bin\openssl.exe

My system configuration: OS - Win 8.1[x64]

I tried no of links given here on stack-overflow but none seemed to work for me.

Please guide me as to where am I doing it wrong.

Response awaited. Thanks.