Generally speaking a computer will come with microsoft update preconfigured so as to get all available updates as soon as they are released
I just checked and everything seems to be up to date as it should be. Now the question of why won't it install?
I did some checking and the extra adventures go in
C:\Documents and Settings\All Users\Shared Documents\The Witcher
I know with vista and 7 when you get the not enough space error it means the public documents folder is missing.
Have you tried installing in safe mode with networking ?
I've just been trying to restart in safe mode but it won't let me. I restart but it won't register when I click F8 or del which is what the screen prompts you to do if you want the setup menu.
I don't understand why everything is always so hard when I try to do something on the computers I own. Everyone else seems to be able to get their stuff to work the way it's supposed to while I end up wasting money on games I never get to play because they won't work properly.