How to stop computer from automatic login to Skype account in order to use Microsoft account?

Dear Community,

My laptop automatically starts running Skype via the Skype account. Now I cannot choose the Microsoft account in order to contact my Messenger friends. I never see the screen again on which I know I can choose for the Microsoft account as well. I got into trouble since I ran the merge to integrate MSN into Skype. Please help.... Anja