When I got the C100 last summer, I installed the program into my home computer (Windows XP) and my laptop (Vista). I have done a couple of updates using the home computer and I believe but am not positive that I had done at least one on the laptop.
Today I went to do an update using the laptop. After getting online, I connected the USB cable from the C100 to the laptop and started the update using the auto feature. The system said No GPS on port 1 and maybe went to port 2 (I wasn't watching very closely). Suddenly I got a nasty blue screen with a ton of white printing saying that something bad was happening, to uninstall any new program. I quickly disconnected the C100 and the laptop shut itself down and then restarted itself.