When I got their last critical update for wxp, my first attempt to download it got a message about my system time and date were wrong and I needed to correct it. So I went to www.time.gov and updated my time to match that. Never happened before. My time was off by less than 1 minutes, and the date was right. So I changed the time to match time.gov and downloaded, installed without any problem. I have been running wxp with SP 2 since it came out some time ago, first time I ever got this message the last critical (or high priority as they call it now) update a couple of days ago.