you could try to use the restore point thingy in windows. I
think it automatically does one when you install stuff, but don't quote me on that. I had the same thing with Line 6's PODs, but I recently reinstalled everything on my laptop, so its not like I can try stuff and tell you how it goes
Another thing would be to look under control panel->system for something like device manager, or drivers.
I would also suggest taking one of you machines to a computer nerd/geek/specialist and get them to look into it. They might be able to fix one, and tell you how to fix the others.