If you are getting an error message saying that MySql cannot start (Error: 0) then you can take the following steps.
1)Click on start->All Programs->MySql Server 4.1->MySql Server Instance Config Wizard.
2)Click next then click on Remove Instance. Then Execute.
3)Now uninstall MySql Server using the Add/Remove Software in the windows control panel.
4)After this has been uninstalled YOU MUST MANUALLY DELETE THE FOLDER WHERE IT WAS INSTALLED. In my case it was installed in: C:\Program Files\MySQL.
5)When this folder has been deleted you can reinstall without restarting and this time you will no longer get the error.
6)Be happy! =)
εκει που εχει 4.1 ειναι η δικια σου MySQL