I have a power mac G5 with Mac OS X 10.5 installed. I am new to macs, but not to PC's in general. My issue is this: I can download but not install/launch new applications. I've tried updating safari but the .pkg file won't open. I've tried a software update from the apple menu but it says there's a network error 1011 yet i'm online?! I tried a standalone download of a combo update but it stopped halfway through...I CANNOT DO ANYTHING!!!* The machine is working fine, no strange noises, I can work everything on the mac as it should (internet, itunes, calendar etc all fine). Why can't I update my software and why can't I launch my new applications/programs that I've downloaded?