I installed MySQL using mysql-installer-5.5.20.0.msi on Windows 7.
From the cmd window, I run \"mysqlshow -u root -p\". It asked for a password, then return
I had the same issue and basically resolved it by pointing to a specific port number that my MySQL server was running on. Below is the command. Please edit the code to fit your case i.e your port number,your mysql server username,your password.