title says it all, with nothing running but the steam client my XP Home install on my MBP under bootcamp hovers between 80-95% CPU usage. i went to the task manager and it looks like "system" is between 20-40 at all times, no idea why. it makes it so that playing The Orange Box is impossible. also i just did a fresh install a few days ago in prep for Orange Box and it ran like a dream until this afternoon. i do not check email on this machine, and have only gone to a couple of websites. AdAware finds nothing. any ideas?