Just got finished uninstalling ESS 3.0 and then installing ESS 4.0 on my friend's Dell Laptop with Vista Home Premium. Went pretty well. Got the updates with no problems. Didn't mess around with the internet connection either. Had a problem with enabling the SSL scanner though. When I enabled it I got some popup about certificates and it completely took me out of Advanced Setup. Don't know how his Internet toys (Yahoo Messenger, Skype, LimeWire,etc...) are gonna react. Not my computer so I can't spend too much time tinkering with it.