>>1428767highlighted area. It should automaticly keep it at a 1:1 ratio if not create a new blank file of 100pixelsX100pixels then set the menu to be like attached image. the entry should be 1 to 1.
If these settings do not hold your likely running win7 as a user and youll need to run PSP as admin set crap then close and reopen as admin and the settings should stay. PS has this same issue of resetting to default on restart.