I would be a bit wary about auto updates for windows systems....MS tends to release updates without making sure they are bug free....

I remember last fall there was an update going on...then suddenly at work we had a rash of xp users unable to sign onto secure webservers and so unable to access email or anything else of importance...we were able to fix it with a system restore (restoring the system to a time before they installed the update)...but unfortunately it was only a temporary solution...once they downloaded the updates again....they would have the same problem....