Erro de Keytool: java.io.FilENOTFoundException: My-Release-Key.KeyStore (acesso é negado) java.io.FileNotFoundException: My-Release-Key.Keystore (o acesso é negado)

Below steps worked for me:

1. Run command prompt as administrator

2. Unchecked the read only options in C:\Program Files\Java\jdk1.6.0_25\bin 
This may not be required

3. keytool -genkey -v -keystore d:\my_private_key.keystore -alias my_key_alias -keyalg RSA -keysize 2048 -validity 10000

4. Tell it to create it in drive D:.
Lokesh003