Just recently I have found that if I open the help file it stays open for a couple of seconds then automatically closes again. If I click on the search box at the top I get the spinning coloured wheel for a couple of seconds more, then it just closes. This is opening the main Finder help. I have tried opening the help files in loads of different applications and they all shut down in various stages. I can't perform any search in help. Any ideas about what I could do to fix it? Or whether it's a virus? I'm on 10.3 Panther iBook G4 and I'm quite new to Macs.