So I have kept my iBook pretty up to date. Software update said I think the last was 10.4.3 in November or December if I remember correctly. Tonight I could not get the finder to work properly. I would click on my home user folder and one other folder and it would simply give me the beachball. It would also sort of freeze up or slow way down where it might take one minute for the menu bar to show that I clicked on. I would sometimes be able to force quit the finder to relaunch and sometimes have to power down and restart. That was problem enough. I got home and the mail, safari, etc. would all work fine. Finder still had issues. I went to software update and proceeded to do the 10.4.5 combined update and it got all the way though until it says optimizing and will not continue on. It has been like this for two hours. I have not installed any new software or changed anything recently. What should I do at this point- Should I power down, try and force quit software update, what???? HELP. I can access my files on the desktop and any in the recent menus for Word but can't access my regular files using the finder window.