I am also having this problem when I try to run certain games. I have been looking for a solution for a while now. Specifically Tomb Raider IV isn't working (exactly the same error message) could this be something to do with Norton 2001? Are you using this software? I found a site that said it had a patch for the game (http://home.t-online.de/home/kubrick/w2kgames.htm) but the rest of the site is in German and therefore I can't navigate it. Does anyone know anything about this? Microsofts own game support update for W2000 doid not help.