I've seen that error a few times on Vista but not every time I render an animation.
My machine used to bluescreen a lot when it tried to automatically play the file in quicktime after rendering so now I've switched to VLC Media player as the default application for .mov files and it's been fine ever since.
For some reason the error has stopped???? I have also noticed that quicktime renders have also stopped auto playing right after an AS file has been rendered. Not sure what I've done to get this to happen either????