Thanks for your reply, MissKathy. However, there is no LDW or Fish Tycoon folder in My Documents, already looked there. Also no files anywhere on my computer of the .ldw type, or named fish and/or tycoon (relating to the game anyway). My settings are to not hide any files so that's not the problem either. That's why I'm confused.
I'm wondering though, if the problem might be that I first used a trial from somewhere else? I uninstalled it and ran CCleaner before installing the full version I bought directly from LDW a week or so ago, but thinking back I can't remember for sure if I actually got to start over or continued the same game.