I had problems with MMPCTV100 - same blue screen - try the SuperTV program - there's a link on the Elbox site (under support/third party software). I found that a bit better than the pre-supplied TV program. I know the MMPCTV210 works from personal experience, and couldn't get the VoodooTVFM working in my setup.
It seems a bit hit-and-miss with the TV cards on the mediator. Good luck getting yours working.