OK, let's deal with that invisible account later, and focus on the Finder's foibles for now. Having jumped there from Mac OS 9 in one fell swoop you may not have realized this, but Lion's Finder options to arrange files in various views have been extended compared to previous OS X versions. Your problem may be related to one of these options, and it would therefore be useful to be aware of them. They are described in
How to arrange and sort files in Lion Finder.
The solutions offered in the following link may or may not apply, but it's worth a shot:
how to stop lion re-arranging my desktop upon startup. Btw, do all Finder windows behave the same way? It would be interesting to know if this includes windows with different default settings like Icon/List/Column etc.
