Thanks for the reply Alan.
Reading your .txt file I realised what the problem was - I had selected the wrong type of device. I had selected "Standalone PVR", "Scientific Atlanta" and "8300DVT" instead of "Cable", "Virgin" and "V+".
Why Slingmedia can't sort out their lists properly I don't know. Virgin are NOT the maunufacturer of my cable box - Scientific Atlanta are !
Anyway its fixed now so thanks for helping out.
Do you know if I will be able to access my Slingbox over the internet if I can see it in a web browser ? I have just got back from holiday where I couldn't use my Slingbox with Slingplayer on Windows. Worked fine in July but not in October :-( I can't thik of anything that changed in the mean time but today I have reset the Slingbox, my wireless router and set both up again from scratch hence my device selection problem. Still have a setup problem in the internet viewing part so I don't know if it is now working ok over the net or not.