A few DUMB questions. from a very un-computer person. My Mac is a PISMO (firewire) G3 with 640 Ram 20Gb HHD Processor PPC 500MHz. OS Is Panther 10.3.9. Planning on installing new OS from a Tiger DVD ( best method please) How much free space ( I have about 7 GB left) do I need to 'install & archive' Tiger 10.4 Will all my old apps be automatically re-installed onto Tiger. i.e.. Browsers, ethernet (internet) connexion, Photoshop, Toast, iTunes iPhoto . Printer /Scanner, Word, Graphic converter and more..... etc. Should I disconnect my Ext. firewire HD and USB stuff while installing. Because for the moment I have both my Itunes library and my IPhoto library on my Ext.-HD.. I'm worried that if I disconnect the ext.-HD and the USB the new OS won't be able to find stuff when I re-plug it all in.... On USB I have an Ext CD burner and USB Audio/Midi interface 'cos my headphone jack is busted. Please keep any answers simple because the idea that I could screw up my perfectly good old OS and computer to boot, is really flipping me out. Thanks.