This is my laptop, it's Vista Home Premium:
http://vaio.sony.co.uk/view/ShowProduct....ory=VN+N+Series
This is the USB enclosure I picked up in the store:
http://www.pcpro.co.uk/reviews/92154...enclosure.html
Yes, it comes with a CD with drivers. My first thought is that this CD isn't Vista-compatible. I'll have a play around this morning and see if I have better luck.