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 found the same error re occurring even after I tried all the above solutions given above. I had even tried version 5.7 and few more. Guys don't waste your time trying to fix it. Rather install version 5.5. It's working perfectly fine without any unnecessary error.