This just in from Warp2search (Thanks Gregg) The new Fix from MS for Windows XP seems to hide more then we thought it would do...
Besides I was talking to my friend Olcay from Winfuture.de, he informed me that the new XP Fix not only adds a new Icon in the New Start menu and new Help files to the System, it also updates "Explorer.exe" up to Build version "6.0.2800.1221". After installing SP1 it was "6.00.2800.1106".
We don´t know what it does what it fixes or else. But the Explorer seems to be more stable to me.