Hello David
I use Workstation 3 with Windows XP Pro S/P 3 all the time with my ProTrack Scanner so might be able to help with problems there.
But not familiar with the Prober, so can't really help with that.
I did try a sample version of Workstation 4 Curtis emailed me, but with lack of time as a self employed engineer, and probably using Workstation 3 & earlier versions for many years, and Polar T6000 fault locator software, I found Workstation 4 so different that I think it needed a few clear weeks of work to get to grips with it. So gave up!
Plus Workstation 4 costs a hell of a lot more than version 3.