doing a search on your hard drive for one of the songs that has turned up missing using the windows search feature... pick music and then the titles?
That is how I found out where my music was disappearing to.
I found out where, not why..... only that it was probably caused by "windows media player" taking over in some way.
You can view the following thread for more info....
http://www.gnutellaforums.com/showth...threadid=18870
Good Luck,
silky