Hi Bengt,
Welcome.
KFlop should certainly work under Vista and W7. We have used the 32-bit versions and other Users have reported sucess under W7 64-bit.
I don't currently have a Vista computer available but it should be similar as under W7.
Try locating KFlop in the Device manager under Universal Serial Bus Controllers
Right click and select Update Driver Software
Select Browse my computer
Enter your <Install Directory>\USB Driver folder
Select KFLOP - Motion Controller 4.xx
Regards
TK