Icons shuffled on Quick Launch

Hello,

I would like some help for this topic.
I’m using a laptop with VistaOS HOme Edition Premium SP1.
I got my frequently used program shortcuts on Quick Launch Bar, arranged in a way familiar to me so that I know quickly what is where.
However, for known reasons to me the Icons are regularly shuffled on that Quick Launch bar, even I’ve checked the Lock the Task Bar line.
Any input will help.
Thank you