From the sound of it, it may be worthwhile taking it back to the drivers. Are you using the latest drivers from the Technisat web site, this is essential? If not, download them, uninstall the existing ones and preferably the card as well and start from scratch.
I'm assuming that you are using Win 2000 or XP, so forget Prog DVB, connect only the Thor LNB, I'm assuming that you are sure it is on the sat. You should be able to start up My theatre and set the LNB settings to intelsat and pick up BBC world without scanning. If you don't get a picture, but you're showing a signal in the taskbar, try dight clicking and turn on video, if this doesn't work, try changing the Graph mode until one works..