RoadRunner,
It has been tested on the Vista with no issues so we are suprised by this. Make sure you had admin rights set for the programme, also monitor your cpu usage via the task manager. Is is very high?
Also note, if you turned all the features and have decreased the update time then turn a few down.
One a side note, more than half of the users connected to the network have 1.4 which is great to see.