Hmmm...my first thought was that your disappearing disk space was due to OSX virtural memory, but judging from your disappearing Documents folder, you might be looking as some sort of directory corruption...You should run Disk Utility (or Disk Warrior if you have it--never been a big Norton fan---and definately dont run an old OS9 version) Also you might want to use Tinkertool to enable seeing invisible files...its possible your Documents folder is still there, but somehow the bit that governs invisiblity got turned on..