I feel for you mate, my newly acquired C860 was giving me a lot of hassle connecting to my work machine (fine at home though). It worked fine at first, but stopped, and despite repeated reboots the USB device was being detected, but it wouldn't see the driver or let me install one. I went through a procedure of trying to manually remove the driver references from the registry, but then discovered from another forum that it would probably kill my machine if I did. Then suddenly it randomly began working again. It's a lottery.