I've just downloaded the update (iatkos v7) and will edit this post if everything goes smoothly.

If I don't, pray for me.

Ok, well it downloads and 'installs' fine, but when it gets to the restart it just closes the menu bar and everything and stays on the blue screen.. it doesn't restart. It doesn't seem to be hanging, the mouse is responsive.. but theres no HD activity. Any help?

I hold down the power button so that it shuts down and then I boot it up, and I go to check the OS version and its still 10.5.7.