If this is going to be a built application then save the data to a file when the user exits and then read that file and initialize the control values upon startup...
If it's going to be a VI then you can programatically make current values default and save the VI when the user exits by opening a reference to the VI and an invoke node.
Check out the following:
http://www.ltrpub.com/insideltr/articles/article_17/article_17.htm
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=B45EACE3E4C756A4E034080020E74861&p_node=DZ52036&p_submitted=N&p_rank=&p_answer=&p_source=External