Windows Vista should automatically update the driver for the CM15A for you, if not, manually check for Upgrades. Before you upgrade try uninstalling the CM15A through Device Manager, and check thebox to remove the current driver for it as well, then do the Windows Upgrade.
I've gotten it to work, but can't update the CM15A without it crashing on me 75% of the time, mainly if I try to change the monitored house code settings and the city location. It still forgets or loses the rooms I have configured so I have to manually load those from a saved file I have elsewhere. You can't use the I-Witness or any other plug-in that requires the use of the VA11A video capture adapter as there is no update for that, and doesn't look like there is going to be one any time soon, let alone an update for the Daylight Savings Time issue. But the DST can be a work around if you have Vista since it already has the patch installed from Microsoft and AHP gets it's info for date and time from the computer system itself. But it'll still screw up in a few weeks when the program goes to tell it that its time for DST change. But maybe by then we can all find a new business that sells products and software that is really supported and actually works with whatever we choose to run it on. You know, maybe even something actually "made in America!" Hahahahahah... somehow I doubt it though.