the server mysqld.exe is usually installed as a service on MS XP. You can check it:
Start > run > enter: services.msc
Examine sevice mysqld whether it is started. If not start it.
If already started and error still exists, examine service mysqld again, then click right mouse key on it to see its properties tabs. Here click on LOG ON tab and check mark for Allow Service To Interact With Desktop.
If you're in one of those predicaments where cls.__private attributes just aren't enough since they can easily be accessed through inst._cls__private, and you need something a little more secure, here's ...