
I have to agree with one of the AC above. I've used NAV/NIS for quite a few years now, and until NIS2008 I had no real complaints (slowing stuff down is a given).
Quite simply NIS2008 is just horrible. For a few months when I asked my PC to shutdown it would seemingly hang on the shutdown screen. A bit of investigation pointed toward a Symantec process just not wanting to go away. This annoyed me so much I even logged a support call with Symmentec. They wheren't much help, but I don't recall seeing the problem as of late, so maybe they fixed that in one of the frequent updates...
...which brings me onto the new LiveUpdate front end. On previous versions of LiveUpdate you'd get a decent window that not only told you what it was downloading, but how big the files where and how much of them it has downloaded. Now you just get something with some red/green traffic lights telling you that it is either downloading or installing updates. So you have no real clue of what it's doing and more importantly, how long it might take.
Stuff like this combined with the nastiness that is Vista has prompted me to move to Mac in a few months when I've saved up my pennies. I know that Macs aren't invunerable and have their own problems, but I've had enough!