Thanks for the reply.
Yes its the Roxio Pro that I have bought.
The xbox 360 was originally (and still is) set up with the composite wires (the tv is "hdmi ready")
Along with the Roxio Pro, I bought 2 x hdmi cables.
As per the set up,
I've got an hdmi cable from Roxio to Tv
Ive got an hdmi cable from Roxio to Xbox 360
Ive got an usb cable from Roxio to coomputer.
When I plug the cables in as above, the xbox loses connection with the tv