Update;
Finally fixed this after hours of playing around.
I tried the External Classic SL 160Gb in a Vista Home machine and it worked first time. This gave me some useful info re the driver being used which turned out to be Samsung so maybe they provide the hardware for Freecom in this case.
I did a system restore on the Vista Ultimate PC to the earliest possible date since I could not be certain other updates etc were having an effect. I created a new folder under C:\ and named it C:\ usb drivers as detailed elsewhere within the driver forum and copied all INF contents into C:\usb drivers.
After boot up I turned the external drive on and to my amazement it was now identified as a Samsung compared to previous Classic SL description. It looked for the driver and was installed, job done.
