Does the ATI MMC crash when you start up the TV (notDTV) app? For me, I had the CC captions set to show up in an external window. Well, it turns out that when MMC couldn't recognize the CC in the external window, it crashes. To fix it, I had to edit the reistry to turn off the external window for CCs. More details later....
Can't run after the install? Uninstall _everything_ ATI related and then install the latest drivers.