Remove the GettingStart.png from the folder
C:\Program Files\Wondershare\Video Studio Express\Skin\Default
and you can use it without any discount thingy in the UI.
No, do not remove it. It's valuable advertisement. I just ordered it and wouldn't have known about it if this advert had not been coming up. And why not? They have a right to although I understand it's boring for someone who's not interested in this product. But 10 Euro's is really a good deal (I hope; did not try yet.....)