That was a **** answer by the way. Might as well have said have you tried unplugging it and plugging it back in?
The S-Bar problem has been going on for a while. I haven't been able to find a fix for it yet.
You might find something on this page that will help.
http://forum.notebookreview.com/msi/
This is where I go for all of my MSi laptop questions.