I have installed SP2 on two laptops, and one of those twice (the second as part of a clean install). The clean install works perfectly, and the two installations over installed versions both appeared to be perfect with one exception: I lost the ability to communicate online. I was able to to get online (both dial-up and DSL), but no significant data could be exchanged (with the firewall off), and there was an icon in the notification area to say that I wouldn't be able to transfer data.



