When I installed MySQL-5.1.49-win32 for the first time I got a window asking 'root password' and 'confirm' in 'mysql server instance configuration wizard'.
Now I uninstall the software and install the same setup. It always asks me for the current root password even after I remove the 'instance' then configure it.
Seems a file containing password is left behind after uninstallation.
I remember my old password and am able to set new root password to anything of my choice. But I don't want MySQL to ask me for the old password while configuring.