Suggest you all read THIS
http://www.theinquirer.net/?article=18527 and THIS
http://www.pcwelt.de/know-how/extras/103039/ ASAP
In certain circumstances after installing SP2 File and Print Sharing is exposed to the world when it previously was not. The fix is not difficult but it is troubling that such a large whoopsie was not picked up.
"Let's do it to them before they do it to us"