Are you using a usb lead with a convertor, if so you will need a specific one which you can get from Tony Kent
http://www.tkracingservices.co.uk/?
Is there a license for your particular dash in the software, if not you need to contact Pi to sort that for you (usualy free).
Can you connect and watch channels?
Also do you have the latest Pi Club Windows software (not the one off the CD) which then works with WIn 7 and XP.
Cheers
Mark