I am having the same problem. Windows XP Prof. Just got connected to DSL... . (Can you believe I was using dial-up for LM???) and now all my downloads are gone.
I'm just trying to learn how to use LM (and yes, the B stands for Blonde) It is pretty complicated for a newbie. I was thinking about upgrading since I now have DSL but now I think not..don't want to pay more for losing my music!