VHD & V+HD boxes are now obselete. Sky Cinema & Sky Sports channels are no longer supported on these boxes as of 31/0719. Sky Cinema On Demand has moved to an internet based system which the older boxes do not have the technology to access. You should have had notification to upgrade to a TiVO or V6 box sometime ago.
If not give Customer Services a call & they will arrange a swap out.
As a Very Insightful Person, I'm here to share my knowledge. I don't work for Virgin Media.