I've noticed over the past few days that my scheduled tasks in Vista are not running on time. For example, a task set to run at 8pm runs about 45 minutes later - in fact 44-45 minutes late seems to be the norm, though one even ran 4 hours later a few days ago.
The computer clock is alright, the task settings - as far as I can tell - are fine (most of these tasks were create a couple of years ago.)
Come to think of it... This MAY have started after the time was set back one hour (I didn't change that manually - Windows took care of it and the time zone settings are fine, plus it's never been a problem before.)